{"title":"Preamp tubes","description":"","products":[{"product_id":"216a-western-electric-display-tube","title":"(DISPLAY TUBE) 216A Western Electric used 1920's","description":"\u003cp\u003eDISPLAY TUBE\u003c\/p\u003e\n\u003cp\u003e216A Western Electric Tennis Ball used 1920's\u003c\/p\u003e\n\u003cp\u003etip is broken off\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eGeneral Information\u003c\/h1\u003e\n\u003cp\u003e- 5-6V Filament @ 1A\u003c\/p\u003e\n\u003cp\u003e- Internal structure similar to VT-2\u003c\/p\u003e\n\u003cp\u003e- 101D can be used as a replacement but with shorter lifespan\u003c\/p\u003e\n\u003cp\u003e- 216A was used in No.10A Loud Speaking Telephone Outfit containing the\u003c\/p\u003e\n\u003cp\u003e- 7A amplifier \u0026amp; 518W receiver\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"216A Western Electric Display Tube","offer_id":476614657,"sku":"216a_display","price":44.44,"currency_code":"USD","in_stock":true}]},{"product_id":"cv4004-12ax7-mullard-nos-1981-v7","title":"(!) (slightly microphonic single) CV4004=12AX7 Mullard NOS 1981 (1.3\/2.1ma)","description":"\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e1 slightly microphonic low noise tube) CV4004=12AX7 Mullard box plates NOS (81-18=1981) \u003c\/strong\u003e\u003c\/span\u003ein original wrapping inside white box\u003c\/p\u003e\n\u003cp\u003e1 section) 1.3ma Gm=1600\u003c\/p\u003e\n\u003cp\u003e1 section) 2.1ma Gm=2000\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eGood Ma = 0.9-1.0mA+\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eGood Gm=150-1600+\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLow Noise\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- EAR 834P\u003cbr\u003e- EAR 864\u003cbr\u003e- Aestetix Rhea phono\u003cbr\u003e- Aestetix Calypso, Io phono\u003cbr\u003e- Art Audio phono\u003cbr\u003e- Audio Research linestage \u003cbr\u003e- Shindo linestage\u003cbr\u003e- Jolida 1000 CD player\u003cbr\u003e- CAT SL-1 Signature Mark III preamp\u003cbr\u003e- Fender Pro Reverb 1967\u003cbr\u003e- Pathos Acoustics T.T. Hybrid Integrated amp (INPOL)\u003cbr\u003e- Belari 129 phono\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":478753349,"sku":"cv4004mull","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/cv4004kt1.jpg?v=1571438751"},{"product_id":"291a-western-electric-nos-1940","title":"291A Western Electric NOS around 1940 (1 pair)","description":"[[start tab]]\n\u003ch1\u003eTube Specs\u003c\/h1\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e1 Matched Pair\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003ePentagrid converter\u003c\/p\u003e\n\u003cp\u003e1940\u003c\/p\u003e\n\u003cp\u003eengraved bases\u003c\/p\u003e\n\u003cp\u003eoriginal boxes with 291A data sheets\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e[[end tab]] [[start tab]]\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch1\u003eTest Data\u003c\/h1\u003e\n\u003cp\u003eTest results on TV-7D\/U:\u003c\/p\u003e\n\u003cp\u003e1 tube) 60\/25\u003c\/p\u003e\n\u003cp\u003e1 tube) 56\/25\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"line-height: 1.2;\"\u003e[[end tab]]\u003c\/span\u003e \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e[[start tab]]\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch1\u003eGeneral Info\u003c\/h1\u003e\n\u003cp\u003e10V Filament\u003c\/p\u003e\n\u003cp\u003eVplate=180V\u003c\/p\u003e\n\u003cp\u003eVgrid1=7.5V\u003c\/p\u003e\n\u003cp\u003eVgrid2=180V\u003c\/p\u003e\n\u003cp\u003eVgrid3=75V\u003c\/p\u003e\n\u003cp\u003eVgrid4=-3V\u003c\/p\u003e\n\u003cp\u003eVgrid5=75V\u003c\/p\u003e\n\u003cp\u003eMu=275\u003c\/p\u003e\n\u003cp\u003eGm=690\u003c\/p\u003e\n\u003cp\u003eRp=400Kohms\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e[[end tab]]\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"291A","offer_id":479133369,"sku":"291a","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/291a1.jpg?v=1571438752"},{"product_id":"6bl7gta-ge-nos-p10","title":"(!!!) (Recommended Pair) 6BL7GTA GE and GE branded Admiral 1960's (38\/40ma and 35\/45ma)","description":"\u003cp\u003e\u003cstrong\u003e1 pair) 6BL7GTA GE NOS 1960's same build\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 tube) 38\/40ma Gm=7300\/7400 (GE branded Admiral 1964)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 tube) 35\/45ma Gm=7200\/8100 (GE 1960's) smaller top getter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMatched on Amplitrex\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003e\u003c\/h1\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Single Power MPX3 SE\u003cbr\u003e- Cary 1610se\u003c\/p\u003e\n(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)\u003cbr\u003eThe 6BL7GTA is interchangeable with a 6BL7GT but differs from it in having\u003cbr\u003ean improved section 1 for increased life as an oscillator, and controlled zero-bias\u003cbr\u003eplate current in both sections\u003cbr\u003eTypical Characteristics Class A Amp:\u003cbr\u003eVplate= 250V\u003cbr\u003eIplate= 42ma\u003cbr\u003eVgrid= -9\u003cbr\u003eRp= 2150 ohms\u003cbr\u003eMu= 15\u003cbr\u003eGm= 6200 for 6BL7 (RCA manual 1953) and 7000 mhos for 6BL7GTA (GE Manual 1957)\u003cbr\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6BL7GTA GE pair","offer_id":495432845,"sku":"6BL7GTApr","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_95816ef7-b744-48fe-a722-e8970874a7e8.jpg?v=1571956641"},{"product_id":"6bl7gta-rv5","title":"(!!!!) (SINGLE) 6BL7GTA RCA NOS 1966 (33.4\/33.0ma)","description":"\u003cp\u003e6BL7GTA RCA NOS 1966\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e33.4ma Gm=6350\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e33.0ma Gm=6900\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood Ma 30-40ma\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eGood Gm 6300-7000\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Single Power MPX3 SE\u003cbr\u003e- Cary 1610se\u003c\/p\u003e\n\u003cp\u003e(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe 6BL7GTA is interchangeable with a 6BL7GT but differs from it in having\u003cbr\u003ean improved section 1 for increased life as an oscillator, and controlled zero-bias\u003cbr\u003eplate current in both sections\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eTypical Characteristics Class A Amp:\u003cbr\u003eVplate= 250V\u003cbr\u003eIplate= 42ma\u003cbr\u003eVgrid= -9\u003cbr\u003eRp= 2150 ohms\u003cbr\u003eMu= 15\u003cbr\u003eGm= 6200 for 6BL7 (RCA manual 1953) and 7000 mhos for 6BL7GTA (GE Manual 1957)\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6BL7GTA","offer_id":495450329,"sku":"6BL7GTA","price":13.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_1d003eeb-3fc8-4551-9569-5d84dc5e4e7a.jpg?v=1776884374"},{"product_id":"6bx7gt-sylvania-nos-v1","title":"(!!) 6BX7GT Sylvania black plates NOS 1960's (56ma\/76ma)","description":"\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e6BX7GT Sylvania black plates NOS 1960's\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e\u003cstrong\u003e1 tube) 56ma Gm=8100\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #80ff00;\"\u003e1 tube) 76ma Gm=8500\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eGood Ma range 38-45ma\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eGood Gm range = 7000-7500\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Single Power\u003c\/p\u003e\n(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)\u003cbr\u003eTypical Characteristics Class A Amp:\u003cbr\u003eVplate= 250V\u003cbr\u003eIplate= 42ma\u003cbr\u003eVgrid= \u003cbr\u003eRp= 1300 ohms\u003cbr\u003eMu= 10\u003cbr\u003eGm= 7600 mhos\u003cbr\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6BXGT Sylvania NOS","offer_id":495647401,"sku":"6BXGT","price":18.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_023558a4-e4ce-417c-8c16-93d21bbee6b8.jpg?v=1662615759"},{"product_id":"6bx7gt-sylv1","title":"(!!!) (Best Single) 6BX7GT Sylvania \"O\" getter NOS 1960's (73.6ma\/83.3ma)","description":"\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e1 tube) 6BX7GT Sylvania \"O\" getter NOS 1960's\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e1 section) 73.6ma Gm=9300\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff2a00;\"\u003e1 section) 83.3ma Gm=9900\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eTested on Amplitrex\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eGood Ma range 38-45ma\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eGood Gm range = 7000-7500\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Single Power\u003c\/p\u003e\n\u003cp\u003e(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)\u003cbr\u003eTypical Characteristics Class A Amp:\u003cbr\u003eVplate= 250V\u003cbr\u003eIplate= 42ma\u003cbr\u003eVgrid= \u003cbr\u003eRp= 1300 ohms\u003cbr\u003eMu= 10\u003cbr\u003eGm= 7600 mhos\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6BXGT Sylvania NOS 1950's","offer_id":495664789,"sku":"6BXGT","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_e1331974-48aa-440d-bcb3-12192a479be2.jpg?v=1761417098"},{"product_id":"6dj8-telefunken-1967","title":"6DJ8 Telefunken Germany \u003c\u003e bottom used\/good 1967 (13.5\/14.0ma)","description":"\u003cp\u003e\u003cstrong\u003e1 tube) \u003c\/strong\u003e\u003cstrong\u003e6DJ8 Telefunken Germany \u0026lt;\u0026gt; bottom 1967 used\/good in white box\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ein white box\u003c\/li\u003e\n\u003cli\u003eSmall \"o\" getter halo\u003c\/li\u003e\n\u003cli\u003egray shield between plates\u003c\/li\u003e\n\u003cli\u003eLow noise and not microphonic\u003c\/li\u003e\n\u003cli\u003every smooth and sweet sounding 6DJ8\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003e1 section) 14.0ma Gm=9500\u003c\/p\u003e\n\u003cp\u003e1 section) 13.5ma Gm=8500\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eGood used Ma range 10-12ma\u003c\/p\u003e\n\u003cp\u003eGood used Gm 9000 - 10,000\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eRecommended for\u003c\/p\u003e\n\u003cp\u003e- Manley Chinook\u003cbr\u003e- Scott Nixon DAC\u003cbr\u003e- Rode K2 mic\u003cbr\u003e- Sunfire Classic Vacuum Tube Control Center \u003cbr\u003e- Woo Audio WA3+\u003cbr\u003e- Pathos Classic One MK III preamp\u003cbr\u003e- Audio Horizons phono\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Tube World","offers":[{"title":"6DJ8 Telefunken used 1967","offer_id":496506137,"sku":"6DJ8tele","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_c502936c-0f5a-4b40-b4be-248e6b04f7d2.jpg?v=1571438756"},{"product_id":"ef86-valvo-germany-branded-siemens-nos-1965-p1","title":"(!!!!!) (Best Pair) EF86 Siemens Germany made by Valvo (Hamburg) NOS 1965 (3.4ma\/3.4ma) 1-2% matched","description":"\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e \u003cstrong\u003e1 Matched Pair) EF86 Siemens Germany made by Valvo NOS 1965 (Hamburg plant)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e1 tube) 3.4ma Gm=2100\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e1 tube) 3.4ma Gm=2200 \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eGood Ma range 2.5-3.5ma\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003eGood Gm range 1800-2200\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch1\u003e \u003c\/h1\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Vox AC10, AC30\u003cbr\u003e- Dr. Z Z-28\u003cbr\u003e- Vox AC15HTVH head (install all Mullard tubes: EF86, 12AX7, EZ81, EL84)\u003cbr\u003e- Eastern Electric M520\u003cbr\u003e- Matchless C-30, SC30\u003cbr\u003e- Bottlehead\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"EF86 Siemens Germany made by Valvo NOS 1965","offer_id":506082589,"sku":"ef86p1","price":138.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_8d321b95-618a-4798-a367-a0e8e7784473.jpg?v=1747775511"},{"product_id":"6bl7gta-sylvania-nos-pair-1a","title":"(!!!) (Best Pair) 6BL7GTA Sylvania branded GE NOS 1967-1968 (42.5\/39.5ma and 40.2\/43.2ma)","description":"\u003cp\u003e1 matched pair) 6BL7GTA Sylvania branded GE NOS 1967-1968\u003c\/p\u003e\n\u003cp\u003e1 tube) 42.5ma\/39.5ma Gm=7500\/7400 \u003c\/p\u003e\n\u003cp\u003e1 tube) 40.2ma\/43.2ma Gm=7600\/7950\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eMatched on Amplitrex\u003c\/p\u003e\n\u003cp\u003eVplate=250V\u003c\/p\u003e\n\u003cp\u003eVgrid=-9V\u003c\/p\u003e\n\u003cp\u003eGood Ma = 32-40ma\u003c\/p\u003e\n\u003cp\u003eGood Gm = 6200 - 7000\u003c\/p\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Single Power MPX3 SE\u003cbr\u003e- Cary 1610se\u003c\/p\u003e\n\u003cp\u003e(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)\u003cbr\u003eThe 6BL7GTA is interchangeable with a 6BL7GT but differs from it in having\u003cbr\u003ean improved section 1 for increased life as an oscillator, and controlled zero-bias\u003cbr\u003eplate current in both sections\u003cbr\u003eTypical Characteristics Class A Amp:\u003cbr\u003eVplate= 250V\u003cbr\u003eIplate= 42ma\u003cbr\u003eVgrid= -9\u003cbr\u003eRp= 2150 ohms\u003cbr\u003eMu= 15\u003cbr\u003eGm= 6200 for 6BL7 (RCA manual 1953) and 7000 mhos for 6BL7GTA (GE Manual 1957)\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6BL7GTA Sylvania NOS pair","offer_id":506538101,"sku":"6BL7GTApr","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_a6b9c9ce-8e94-4595-9b12-862a0da5d142.jpg?v=1773691979"},{"product_id":"6bl7gt-sylvania-used-like-new-1953","title":"6BL7GT Sylvania low hours 1953 D = rectangle getter halo  long scratch on base (33.5\/37.5ma)","description":"\u003cp\u003e\u003cstrong\u003e1 tube) 6BL7GT Sylvania low hours 1953 \u003c\/strong\u003e\u003cstrong\u003eD = rectangle getter halo\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003elong scratch on base\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e33.5ma Gm=6300\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e37.5ma Gm=6800\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Single Power MPX3 SE\u003cbr\u003e- Cary 1610se\u003c\/p\u003e\n(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)\u003cbr\u003eThe 6BL7GTA is interchangeable with a 6BL7GT but differs from it in having\u003cbr\u003ean improved section 1 for increased life as an oscillator, and controlled zero-bias\u003cbr\u003eplate current in both sections\u003cbr\u003eTypical Characteristics Class A Amp:\u003cbr\u003eVplate= 250V\u003cbr\u003eIplate= 42ma\u003cbr\u003eVgrid= -9\u003cbr\u003eRp= 2150 ohms\u003cbr\u003eMu= 15\u003cbr\u003eGm= 6200 for 6BL7 (RCA manual 1953) and 7000 mhos for 6BL7GTA (GE Manual 1957)\u003cbr\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6BL7GT Sylvania 1953","offer_id":506554057,"sku":"6BL7GT","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_72f81b94-c7f9-4441-b670-2d0130a978b0.jpg?v=1571957171"},{"product_id":"ecc85-siemens-halske-germany-branded-rca-p11","title":"(!) (Good Value Pair) ECC85 Siemens Halske Germany branded RCA NOS 1966-1969 (9.2\/8.6ma and 9.8\/9.5ma)","description":"\u003cp\u003e1 low noise pair) ECC85=6AQ8 Siemens Halske Germany branded RCA NOS 1966-1969\u003c\/p\u003e\n\u003cp\u003e1 tube) 9.2\/8.6ma Gm=6000\/6000 (1969)\u003c\/p\u003e\n\u003cp\u003e1 tube) 9.8\/9.5ma Gm=6400\/6400 (1966)\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"ECC85 Siemens Halske Germany branded RCA NOS","offer_id":507013461,"sku":"6aq8","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_6e83fbfe-e014-4a3e-8e9a-9066d7ad9f66.jpg?v=1776187165"},{"product_id":"ec92-valvo-germany-by-siemens-nos-1972","title":"(!!!!) (Recommended Single) EC92 Valvo Germany by Siemens NOS 1972 (12.5ma)","description":"\u003cp\u003eEC92 Valvo Germany by Siemens NOS 1972\u003c\/p\u003e\n\u003cp\u003e12.5ma\u003c\/p\u003e\n\u003cp\u003eGm=6600\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eGood mA range 7-10ma\u003c\/p\u003e\n\u003cp\u003eGood Ma range 4800-5500\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":507489913,"sku":"EC92","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_bb214ff4-3675-42c4-8350-78760b46054f.jpg?v=1682139420"},{"product_id":"6an8a-rca-nos-p11","title":"(!!) (Best Pair #2) 6AN8A RCA NOS 1970 - 1973 (18\/14ma and 16\/14ma)","description":"\u003cp\u003e1 pair) 6AN8A RCA NOS original boxes \u003c\/p\u003e\n\u003cp\u003e1 tube) 18ma Gm=4800 and 14ma Gm=8300 branded Motorola\u003c\/p\u003e\n\u003cp\u003e1 tube) \u003cspan\u003e16ma Gm=4500 and 14ma Gm=7700\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eMatched on Amplitrex\u003c\/p\u003e\n\u003cp\u003eGood Ma\/Gm (triode) = 13-15ma and Gm= 3800-4500\u003c\/p\u003e\n\u003cp\u003eGood Ma\/Gm (pentode) =  11-12ma Gm=7000-7500\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":507501457,"sku":"6AN8A","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/2_b5de2dae-e1b0-45bf-b1c8-22943c359e7f.jpg?v=1752871364"},{"product_id":"6an8a-rca-nos-p2","title":"(!!!) (Best Pair) 6AN8A RCA Motorola NOS 1973 (17.6\/14.6ma and 16.5\/15.6ma)","description":"\u003cp\u003e1 pair) 6AN8A Motorola RCA NOS original boxes 1973\u003c\/p\u003e\n\u003cp\u003e1 tube) 17.6ma Gm=4900 and 14.6ma Gm=9800\u003c\/p\u003e\n\u003cp\u003e1 tube) \u003cspan\u003e16.5ma Gm=4700 and 15.6ma Gm=10,300\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eMatched on Amplitrex\u003c\/p\u003e\n\u003cp\u003eGood Ma\/Gm (triode) = 13-15ma and Gm= 3800-4500\u003c\/p\u003e\n\u003cp\u003eGood Ma\/Gm (pentode) =  11-12ma Gm=7000-7500\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":507502125,"sku":"6AN8Apair","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_b73d04c0-6832-43be-adf0-78271896afa3.jpg?v=1752871288"},{"product_id":"6021-probably-made-by-ei-yugoslavia-nos-1970-s-1980-s","title":"6021 probably made by EI Yugoslavia NOS 1970's - 1980's (1 pair)","description":"\u003cpre\u003e1 matched pair) 6021 probably made by EI Yugo NOS 1970's - 1980's\u003cbr\u003e\u003cbr\u003e20 pairs in stock\u003cbr\u003e\u003cbr\u003e- Audio Aero Capitole Mk II cd player\u003cbr\u003e- Audio Aero Prima cd player\u003cbr\u003e- Audio Aero Capitole preamp\u003cbr\u003e- Audio Aero Capitole Classic SE\u003cbr\u003e- Audio Aero Capitol Reference 2007\u003cbr\u003e- Audio Aero Prestige SACD\/CD Player\u003cbr\u003e- Vincent SP 331 amplifier (upgrade from 6N16 tube)\u003c\/pre\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":516648329,"sku":"6021ei","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/6021ei1.jpg?v=1571438768"},{"product_id":"6sn7gtb-cbs-short-bottle-nos-1961-p1","title":"(!!!!) (BEST PAIR) 6SN7GTB CBS SHORT BOTTLE NOS 1961 same date codes (8.4\/8.5ma and 8.2\/8.9ma) (similar to Sylvania) (Close Gm) (Schiit Freya, Rogue, Cary)","description":"\u003cp\u003e1 low noise pair) 6SN7GTB CBS SHORT BOTTLE NOS 1961 same date codes (similar to Sylvania) (strong Gm)\u003cbr\u003e1 tube) 8.4\/8.5ma Gm=2900\/2900\u003cbr\u003e1 tube) 8.2\/8.9ma Gm=2700\/2900\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eSchiit Freya\u003c\/p\u003e\n\u003cp\u003eRogue\u003c\/p\u003e\n\u003cp\u003eModwright OPPO\u003c\/p\u003e\n\u003cp\u003eCary\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- similar build and sound to Sylvania with black plates\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6SN7GTB CBS NOS","offer_id":517272529,"sku":"6SN7GTBcbspr","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/4_fe10de44-8eed-4504-a89f-93ffabffb00f.jpg?v=1777235020"},{"product_id":"6sn7gtb-gep15","title":"(!!!!!) (BEST VALUE PAIR #1) 6SN7GTB GE coin-base NOS 1980 same date codes (7.4\/7.6ma and 7.8\/7.6ma) (same Gm) (Schiit Freya, Rogue)","description":"\u003cp\u003e1 low noise pair) 6SN7GTB GE NOS 1980 (JR) 1-3% matched \u003cbr\u003e1 tube) 7.4\/7.6ma Gm=2500\/2500\u003cbr\u003e1 tube) 7.8\/7.6ma Gm=2500\/2500 slightly taller\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003e(Schiit Freya, Rogue)\u003c\/h1\u003e","brand":"Tube World","offers":[{"title":"6SN7GTB GE","offer_id":517277473,"sku":"6SN7GTBpr","price":68.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_58512993-90e8-475f-839e-5eda3bd69931.jpg?v=1756881170"},{"product_id":"copy-of-6sn7gtb-ge-nos-1970s-p4-1","title":"(slightly microphonic) 6SN7GTA GE NOS 1952 copper grid posts (7.4\/10ma)","description":"\u003cp\u003e1 slightly microphonic tube) 6SN7GTA GE NOS 1952 copper grid posts\u003c\/p\u003e\n\u003cp\u003e7.4ma Gm=2300\u003c\/p\u003e\n\u003cp\u003e10ma Gm=2500\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003etube is etched 6SN7GTA\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003every good detail, inner resolution and air\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6SN7GT","offer_id":517288133,"sku":"6SN7GTA","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_46f686fa-8988-4a6f-83ae-6ad15c4e5cbf.jpg?v=1571438769"},{"product_id":"6sn7gtb-tungsol-nos-1960-era","title":"(!!!) (Good Value Single) 6SN7GTB Tungsol tall bottle used\/good 1960 era (7.5\/7.5ma) 1% section balance","description":"\u003cp\u003e1 low noise tube) 6SN7GTB Tungsol tall bottle used\/good 1960 era 1% section balance\u003c\/p\u003e\n\u003cp\u003e1 section) 7.5ma Gm=2300\u003c\/p\u003e\n\u003cp\u003e1 section) 7.5ma Gm=2300\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- Cary\u003c\/p\u003e\n\u003cp\u003e- Antique Sound Lab\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6SN7GTB Tungsol NOS 1960 era","offer_id":517424405,"sku":"6SN7GTBts","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_2b1422d2-f9f3-4dcc-a0d4-e8e98be592f0.jpg?v=1663559048"},{"product_id":"copy-of-e88cc-6922-siemens-halske-nos-1964","title":"E88CC=6922 Siemens Halske Germany \"gray shield\" Gold Pins used\/good 1963 (10.6\/12.2ma)","description":"\u003cp\u003e1 low noise tube) E88CC=6922 Siemens Halske Germany \"gray shield\" Gold Pins used\/good 1963 faded printing \u003c\/p\u003e\n\u003cp\u003e1 section) 12.2ma Gm=10,900\u003c\/p\u003e\n\u003cp\u003e1 section) 10.6ma Gm=9600\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6922","offer_id":518255793,"sku":"6922siem","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/6922siem632.jpg?v=1571438770"},{"product_id":"copy-of-6922-amperex-usa-pq-nos-1968","title":"(slightly microphonic) 6922 Amperex PQ Holland 1962 low hours\/like new (11.2\/11.6ma)","description":"\u003cp\u003e1 tube slightly microphonic) 6922 Amperex PQ Holland 1962 low hours\/like new excellent printing - reboxed\u003c\/p\u003e\n\u003cp\u003e1 section) 11.2ma Gm=11,000\u003c\/p\u003e\n\u003cp\u003e1 section) 11.6ma Gm=11,000\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003emicrophonics are minor, not major\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6922","offer_id":518262253,"sku":"6922_1962pq","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/6922amp62.jpg?v=1571438770"},{"product_id":"jan-6922-amperex-usa-1971","title":"(!!!!) (Best Value Single) JAN-6922 Amperex USA like new 1971 (13.4\/12.6ma)","description":"\u003cp\u003e1 low noise tube) JAN-6922 Amperex USA globe logo like new (7L9-*1E=1971)\u003c\/p\u003e\n\u003cp\u003e1 section) 13.4ma Gm=12,200\u003c\/p\u003e\n\u003cp\u003e1 section) 12.6ma Gm=12,100\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003eGood Ma = 12-15ma\u003c\/p\u003e\n\u003cp\u003eGood Gm = 11K-13K\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"JAN-6922 Amperex USA 1971","offer_id":518264045,"sku":"6922_1965","price":98.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_575cda41-9397-4345-9a64-04548100a5bc.jpg?v=1705007219"},{"product_id":"copy-of-6sl7gt-brimar-black-base-gray-plates-1950s-v3","title":"6SL7GT Brimar NOS black base black plates 1950's (2.2\/2.4ma) (slightly microphonic)","description":"\u003cp\u003e1 low noise slightly microphonic tube) 6SL7GT Brimar NOS black plates D getter 1950's \u003c\/p\u003e\n\u003cp\u003e1 section) 2.2ma Gm=1500\u003c\/p\u003e\n\u003cp\u003e1 section) 2.4ma Gm=1600\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- Ampeg Heritage B-15 \u003cbr\u003e- Alessandro Itallian Greyhound jazz amp\u003cbr\u003e- Alessandro Black and Tan 2005\u003cbr\u003e- Almarro A318B\u003cbr\u003e- Eddie Current\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6SL7GT","offer_id":518875381,"sku":"6SL7GT","price":79.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/6sl7gtbrim_micro.jpg?v=1571438770"},{"product_id":"272a-western-electric-used-1950s-pair","title":"(!!) (Good Value Pair) 272A Western Electric \"meshplate\" used\/good 1951 and 1956 (5.8ma and 5.9ma)","description":"\u003cp\u003e\u003cstrong\u003e1 pair) 272A WE \"meshplate\" used\/good in white boxes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 tube) 5.8ma Gm=800 (5639=1956)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 tube) 5.9ma Gm=800 (113=1951)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eGeneral Information:\u003c\/p\u003e\nVfil=10V @ 320ma, Vplate=140V, Iplate=5.4ma, Mu=5.6, Gm=670, Rp=7400 ohms\u003cbr\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"272A WE PAIR","offer_id":519002629,"sku":"272a","price":219.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_365f2bc2-2f0b-413d-be0a-1c99586f6022.jpg?v=1649137026"},{"product_id":"12b4a-rca-p5","title":"(!) (Pair) 12B4A RCA NOS 1971-1974 (42ma and 36.5ma)","description":"\u003cp\u003e1 matched pair) 12B4A RCA NOS 1971-1974\u003c\/p\u003e\n\u003cp\u003e1 tube) 36.5ma Gm=6500\u003c\/p\u003e\n\u003cp\u003e1 tube) 42.0ma Gm=7100\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e Matched on Amplitrex AT1000\u003c\/p\u003e\n\u003cp\u003e(Vplate=140V, Vgrid=-15V, Good Iplate range 25-40ma)\u003c\/p\u003e\n\u003cp\u003eGood Gm range 5500-7000\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":522173809,"sku":"12B4Apair","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_11e4766c-cf81-43c3-8c0a-5599ff6b1f6a.jpg?v=1776113391"},{"product_id":"12bh7a-rca-p4","title":"(!!!!) (Good Value Pair) 12BH7A RCA gray plates NOS 1966-1971 (8.8\/12ma and 12.8\/8.2ma) (Art Audio, Manley Mac, VTL)","description":"\u003cp\u003e1 low noise pair) 12BH7A RCA gray plates NOS 1966-1971 same build\u003c\/p\u003e\n\u003cp\u003e1 tube) 8.8\/12ma Gm=2900\/3500 (1971)\u003c\/p\u003e\n\u003cp\u003e1 tube) 12.8\/8.2ma Gm=3100\/2600 (1966)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e \u003c\/strong\u003e\u003cstrong\u003eLow Noise and not microphonic\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e  \u003cbr\u003e\u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- McIntosh 275\u003cbr\u003e- VTL\u003cbr\u003e- Manley\u003cbr\u003e- Kora Hermes DAC in place of 12AU7\u003cbr\u003e- Octave M90 mono amps (http:\/\/www.octave.de\/)\u003cbr\u003e- BLACKSTAR HT-5 (replacing Sovtek)\u003cbr\u003e- Luxman MA-88 amp\u003cbr\u003e- Requisite Audio preamp\u003cbr\u003e- Teletronix LA-2A Compressor\/Limiter\u003cbr\u003e- Art Audio Diavolo amp\u003cbr\u003e- Ray Samuels\u003cbr\u003e- Kendrick Solo 7\u003cbr\u003e- Valvet L1\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"12BH7A RCA PAIR","offer_id":526140773,"sku":"12BH7Apr","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_9d1b0da4-ad1f-4844-aeec-94f12eb8398b.jpg?v=1776108974"},{"product_id":"6350-rca-single-1","title":"(!!) 6350 RCA NOS triple mica \"U\" getter NOS 1960 era (12.8\/13.2ma)","description":"\u003cp\u003e1 tube) 6350 RCA NOS triple mica \"U\" getter NOS 1960 era\u003c\/p\u003e\n\u003cp\u003e12.8ma Gm=4400\u003c\/p\u003e\n\u003cp\u003e13.2ma Gm=5400\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003erecommendd for:\u003c\/p\u003e\n\u003cp\u003e- VTL Wotan MB1250, VTL MB450, VTL MB300, VTL 225 Deluxe, VTL Deluxe 140, VTL Stereo 120\/50, VTL ST150\u003c\/p\u003e\n\u003cp\u003e- VTL Siegfried\u003c\/p\u003e\n\u003cp\u003e- Joule Electra LA-150 (mk2)\u003c\/p\u003e\n\u003cp\u003e- Joule Electra LA 100 Mk.III\u003c\/p\u003e\n\u003cp\u003e- Shindo-lab Corton\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6350 RCA triple mica NOS","offer_id":527077513,"sku":"6350","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/6350rcatriple.jpg?v=1571438774"},{"product_id":"copy-of-12at7-raytheon-nos-d-getter-mid-1950s-single","title":"(!) 12AT7WA Raytheon NOS black plates - triple mica - O getter halo 1960's mis-matched triode sections (7\/12ma)","description":"\u003cp\u003e1 low noise tube) 12AT7WA Raytheon NOS black plates - triple mica - O getter halo 1960's mis-matched triode sections in white box\u003c\/p\u003e\n\u003cp\u003e7ma Gm=4000\u003c\/p\u003e\n\u003cp\u003e12ma Gm=5300\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Eclair Engineering 'Evil Twin' Tube DI (direct input box)\u003cbr\u003e- Atma-sphere preamp\u003cbr\u003e- JC Morrison custom phono \u003cbr\u003e- David Berning Quadrature Z amp\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"12AT7WA Raytheon","offer_id":527436401,"sku":"12AT7waray","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_f96f51b6-c253-479b-b76d-4ee5797025de.jpg?v=1745266450"},{"product_id":"copy-of-12at7-philips-miniwatt-made-in-hamburg-germany-by-valvo-nos-1959-single-1","title":"12AT7 RCA Black Plates \"D\" getter used\/good mid-1950's","description":"\u003cp\u003e1 low noise tube) 12AT7 RCA Black Plates \"D\" getter used\/good mid-1950's\u003c\/p\u003e\n\u003cp\u003eAmplitrex Test Data:\u003c\/p\u003e\n\u003cp\u003e1 section) 9.6ma Gm=3700\u003c\/p\u003e\n\u003cp\u003e1 section) 9.2ma Gm=4700\u003c\/p\u003e\n\u003cp\u003eGood Ma range for used 7-9ma\u003c\/p\u003e\n\u003cp\u003eGood Gm range for used 4000-5000\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cpre\u003e\u003cbr\u003e- Earmax Anniversary\u003cbr\u003e- Lector\u003cbr\u003e- Berning\u003c\/pre\u003e","brand":"Tube World","offers":[{"title":"12AT7","offer_id":530716849,"sku":"12AT7rca","price":24.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/12at7r96.jpg?v=1571438775"},{"product_id":"6cg7-tungsol","title":"(!!!!) (Single) 6CG7 Tungsol NOS 1960 era black shield between plates - pin #3 slightly shorter (8.6ma\/10ma)","description":"\u003cp\u003e1 low noise tube) 6CG7 Tungsol NOS 1960 era black shield between plates good printing\u003c\/p\u003e\n\u003cp\u003epin #3 shorter than the others - see photos\u003c\/p\u003e\n\u003cp\u003e1 section) 8.6ma Gm=2600\u003c\/p\u003e\n\u003cp\u003e1 section) 10ma Gm=2900\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eRecommended for:\u003c\/p\u003e\n\u003cp\u003eConrad Johnson\u003c\/p\u003e\n\u003cp\u003eAudio Research\u003c\/p\u003e\n\u003cp\u003eAmpeg\u003c\/p\u003e\n\u003cp\u003eStax\u003c\/p\u003e\n\u003cp\u003eMarantz\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"6CG7 Tungsol 1960 era","offer_id":531226613,"sku":"6CG7ts","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_0a12b003-8be7-4c90-9be1-05c657719f26.jpg?v=1762721298"},{"product_id":"ell80-6hu8-valvo-nos-branded-sylvania","title":"(!!!) (Best Pair) ELL80=6HU8 Valvo Germany NOS branded Sylvania and Dumont 1965-1966 (22\/21ma and 21\/22.5ma)","description":"\u003cp\u003e1 pair) ELL80=6HU8 Valvo Germany NOS same build\u003c\/p\u003e\n\u003cp\u003e1 tube) 21\/22ma Gm=6200\/6100 (Sylvania 1966)\u003c\/p\u003e\n\u003cp\u003e1 tube) 21\/22.5ma Gm=5900\/6300 (Dumont 1965)\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cb\u003e \u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e- Fisher SA1000 amp\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e- German Radios\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":531857489,"sku":"ELL80","price":219.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_f35732ae-15c6-47e9-a4e3-e37c2dcd93fc.jpg?v=1741206505"},{"product_id":"6u8-used","title":"6U8A used\/good","description":"\u003cp\u003e30) 6U8\/A US Brands used\/test good\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- VOX\u003c\/p\u003e\n\u003cp\u003e- Radford STA-15 Series III 1965\u003c\/p\u003e\n\u003cp\u003e- McIntosh MX-110\u003c\/p\u003e\n\u003cp\u003e- Grommes PHI-26\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":532652993,"sku":"6U8Aused","price":4.99,"currency_code":"USD","in_stock":true}]},{"product_id":"6u8a-ge-nos-1977","title":"(!!!!) (Single) 6U8A GE NOS 1977 (15ma\/9.4ma)","description":"\u003cp\u003e1 tube) 6U8A GE NOS 1977\u003c\/p\u003e\n\u003cp\u003e15ma Gm=6600 (triode)\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e9.4ma Gm=5500 (pentode)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- VOX\u003c\/p\u003e\n\u003cp\u003e- Radford STA-15 Series III 1965\u003c\/p\u003e\n\u003cp\u003e- McIntosh MX-110\u003c\/p\u003e\n\u003cp\u003e- Grommes PHI-26\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":532663633,"sku":"6U8Age","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_1_d3eac718-c8f8-4b31-80ce-a7546e03905f.jpg?v=1768258506"},{"product_id":"copy-of-12ax7-rca-black-plates-d-getter-used-1950s-v2-1","title":"(!!) 12AX7 GE branded Video black plates D getter 1957 used mis-matched triode sections (1.1ma\/0.6ma)","description":"\u003cp\u003e1 low noise tube) 12AX7 GE branded Video black plates D getter 1957 used mis-matched triode sections\u003c\/p\u003e\n\u003cp\u003e1.1ma Gm=1600\u003c\/p\u003e\n\u003cp\u003e0.6ma Gm=1100\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Vincent CD-S6 CD Player\u003cbr\u003e- Dumble Overdrive Special clone amp \u003cbr\u003e- Fender Twin Reverb 1964, 1966, 1990\u003cbr\u003e- Two-Rock Custom Reverb Signature V1\u003c\/p\u003e\n\u003cp\u003e- Fender Deluxe Reverb 1964, 1966\u003cbr\u003e- UESUGI TAE-4 phono 2008\u003c\/p\u003e\n\u003cp\u003e- Fender Princeton Reverb\u003cbr\u003e- Fender Super 6 Reverb 1970's\u003cbr\u003e- VOX AC15\u003cbr\u003e- Fender '64 Vibroverb\u003cbr\u003e- SUPRO model # 1616T\u003cbr\u003e- Conrad Johnson MV60SE\u003cbr\u003e- Shanling CD-S100SE HDCD player \u003cbr\u003e- Universal 175\u003cbr\u003e- Teletronix LA-2A Compressor\/Limiter\u003cbr\u003e- Behringer T1954 Ultrafex\u003cbr\u003e- Conrad Johnson MV60 2002\u003cbr\u003e- McIntosh C8 phono\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"12AX7","offer_id":532824957,"sku":"12ax7sylbp","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_6f465b3e-7301-4d32-bff0-a0d043b7a058.jpg?v=1751344687"},{"product_id":"ecc34-mullard-nos-1950-s-single","title":"(Best Single) ECC34 Mullard NOS 1950's (10.1ma\/10.2ma)","description":"\u003cp\u003e1 platinum low noise tube) ECC34 Mullard gray plates NOS \"D\" getter halo 1950's reboxed (10.1ma\/10.2ma) BEST SINGLE\u003c\/p\u003e\r\n\u003cp\u003etypical operation:\u003cbr\u003e(Vplate = 250V, Vgrid = -16V, Iplate = 10ma, Gm = 2200, Rplate = 5.2K, Mu = 11.5)\u003cbr\u003e(ECC32 Mu = 32, ECC34 Mu = 11.5)\u003c\/p\u003e\r\n\u003cp\u003e \u003c\/p\u003e\r\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":534065977,"sku":"ECC34","price":349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/ecc341.jpg?v=1571438777"},{"product_id":"copy-of-ecc34-mullard-nos-1950s-single","title":"ECC34 Mullard NOS 1950's (9ma\/10ma)","description":"\u003cp\u003e1 low noise tube) ECC34 Mullard gray plates NOS \"upside down platter shape\" getter halo reboxed (9\/10ma)\u003c\/p\u003e\r\n\u003cp\u003etypical operation:\u003cbr\u003e(Vplate = 250V, Vgrid = -16V, Iplate = 10ma, Gm = 2200, Rplate = 5.2K, Mu = 11.5)\u003cbr\u003e(ECC32 Mu = 32, ECC34 Mu = 11.5)\u003c\/p\u003e\r\n\u003cp\u003e \u003c\/p\u003e\r\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":534066317,"sku":"ECC34","price":329.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/ecc342.jpg?v=1571438777"},{"product_id":"26-coronado","title":"26 Coronado by RCA tests like new 1940's (6.0ma)","description":"\u003cp\u003e26 Coronado by RCA tests like new 1940's\u003c\/p\u003e\n\u003cp\u003e6.0ma\u003c\/p\u003e\n\u003cp\u003eGm=1200\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003eVplate=180V\u003c\/p\u003e\n\u003cp\u003eVgrid=-14.5V\u003c\/p\u003e\n\u003cp\u003eNOS Ma = 5.5ma - 6ma\u003c\/p\u003e\n\u003cp\u003eNOS Gm=1100\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":534303281,"sku":"26","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_625008ec-df4c-4723-9881-921f9707f74a.jpg?v=1583796852"},{"product_id":"26-st-14-nu-used","title":"26 ST-14 National Union used\/good 1950 era (3.8ma, Gm=900)","description":"\u003cp\u003e26 ST-14 National Union used\/good 1950 era\u003c\/p\u003e\n\u003cp\u003e3.8ma\u003c\/p\u003e\n\u003cp\u003eGm=900\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":534304261,"sku":"26used","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_e515aa62-a85e-40bd-be5d-0a11e1c39ead.jpg?v=1612900718"},{"product_id":"26-nu-v1","title":"26 National Union ST-14 used\/like new 1940's (6.1ma)","description":"\u003cp\u003e26 National Union ST-14 used\/like new 1940's\u003c\/p\u003e\n\u003cp\u003e6.1ma\u003c\/p\u003e\n\u003cp\u003eGm=1100\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"26","offer_id":534305701,"sku":"26","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_145ed3af-3dde-40ae-8c98-7c5f70d2761f.jpg?v=1733873716"},{"product_id":"x-226-and-mx-226-no-name-balloon-pair","title":"(!!) (Best Value Pair) X-226 and MX-226 no name balloon used\/like new 1920's same build (6.3mA and 6.5ma)","description":"\u003cp\u003e1 pair) X-226 and MX-226 no name balloon used\/like new 1920's\u003c\/p\u003e\n\u003cp\u003e1 tube) 6.3mA Gm=1100 (X-226)\u003c\/p\u003e\n\u003cp\u003e1 tube) 6.5ma Gm=1100 (MX-226)\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":534306501,"sku":"226pr","price":44.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/2_a58c25f9-f3b9-4469-ac59-611a2253048b.jpg?v=1700267062"},{"product_id":"26-rca-radiotron-balloon-used-good-1920s","title":"(!!) 26 RCA Radiotron balloon used\/good 1920's (6.2mA Gm=900)","description":"\u003cp\u003e26 RCA Radiotron balloon used\/good 1920's\u003c\/p\u003e\n\u003cp\u003e6.2mA\u003c\/p\u003e\n\u003cp\u003eGm=900\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"26 RCA","offer_id":534316833,"sku":"26","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_e203b02a-ef46-4408-8734-5c6c7c817345.jpg?v=1661961242"},{"product_id":"copy-of-ec806s-e86c-telefunken-gold-pins-kuhl-tube-cryo-nos-1960s-v1","title":"EC88=6DL4 United France NOS 1981-1982 (2 single tubes)","description":"\u003cp\u003e1 tube $8.95) EC88=6DL4 United France NOS 1981-1982 (14ma Gm=17,000)\u003c\/p\u003e\n\u003cp\u003e1 tube $8.95) EC88=6DL4 United France NOS 1981-1982 (10.5ma Gm=14,000)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- Marantz 10B\u003cbr\u003e- Bruce Moore\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":542218081,"sku":"EC88","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/ec88un.jpg?v=1571438779"},{"product_id":"ec88-6dl4-amperex-germany-nos-1972-single","title":"EC88=6DL4 Valvo branded Amperex Germany NOS 1972 (11.5ma)","description":"\u003cp\u003e1 tube) EC88=6DL4 Valvo branded Amperex Germany NOS 1972 (11.5ma) Gm=12,600\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e- Marantz 10B\u003cbr\u003e- Bruce Moore\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":542226429,"sku":"EC88","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/ec88amp.jpg?v=1571438779"},{"product_id":"5963-12au7-sylvania-nos-1959","title":"(!!) (Best Single) USN-CHS-5963=12AU7 Sylvania NOS \"D\" getter 1959 (10.6\/11.8ma)","description":"\u003cp\u003e1 low noise tube) USN-CHS-5963=12AU7 Sylvania NOS \"D\" getter tack welded to plate post 1959\u003c\/p\u003e\n\u003cp\u003e1 section) 10.6ma Gm=2200\u003c\/p\u003e\n\u003cp\u003e1 section) 11.8ma Gm=2400\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eUSN=US Navy\u003c\/p\u003e\n\u003cp\u003e(5963=computer rated 12AU7\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e- Bottlehead Forplay III\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e- CAT SL-1L\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003e- Wavelength Sine\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":544708361,"sku":"5963_1959","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/2_46939c84-a691-4d98-9f8d-5a5507802e66.jpg?v=1629297728"},{"product_id":"6au6wc-sylvania","title":"6AU6WC Sylvania NOS 1970-1980 (0 in stock)","description":"\u003cp\u003eJAN-6AU6WC Sylvania NOS 1970-1980\u003c\/p\u003e\n\u003cp\u003e0) 6.9ma Gm=4200 1971\u003c\/p\u003e\n\u003cp\u003e0) 6.5ma Gm=3900 1974\u003c\/p\u003e\n\u003cp\u003e0) 6.2ma Gm=4100 1971\u003c\/p\u003e\n\u003cp\u003e0) 6.8ma Gm=4100 1974\u003c\/p\u003e\n\u003cp\u003e0) 6.3ma Gm=4000 1971\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e0) 6.5ma Gm=3900 1974\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e1) 6.0ma Gm=3800 1971\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eGood Ma 6.5-7.5ma\u003c\/p\u003e\n\u003cp\u003eGood Gm = 4000\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":546157593,"sku":"6AU6WC","price":9.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/6au6wcs1.jpg?v=1571438781"},{"product_id":"5814a-rca-nos-1970-era-slightly-microphonic","title":"5814A RCA NOS 1970 era slightly microphonic (10.2\/11.2ma)","description":"\u003cp\u003e1 slightly microphonic low noise tube) 5814A RCA NOS 1970 era in WB\u003c\/p\u003e\n\u003cp\u003e10.2ma Gm=2200\u003c\/p\u003e\n\u003cp\u003e11.2ma Gm=2300\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eRecommended for\u003c\/h1\u003e\n\u003cp\u003e- Woo Audio WA4 headphone amp\u003c\/p\u003e\n\u003cp\u003e- Bottlehead Crack\u003c\/p\u003e\n\u003cp\u003e- Bottlehead Foreplay\u003c\/p\u003e\n\u003cp\u003e- CJ PV12\u003c\/p\u003e\n\u003cp\u003e- Jadis amp\u003c\/p\u003e\n\u003cp\u003e- Unison Research Unico-P 2005\u003c\/p\u003e\n\u003cp\u003e- Einstein preamp\u003c\/p\u003e\n\u003cp\u003e- Head-Direct EF1 Hybrid Headphone Amp 2008\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"5814A RCA NOS 1970 era slightly microphonic","offer_id":549557817,"sku":"5814A","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/1_27d02e07-7fd9-424c-9563-0b6ca5c86dfc.jpg?v=1604094374"},{"product_id":"copy-of-01a-rca-cunningham-nos-1930s-v1","title":"01A National Union NOS 1940's (3.1ma)","description":"\u003cp\u003e1 tube) 01A Nat. Union NOS original box (3.1ma Gm=750)\u003c\/p\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003eGood Ma = 3ma\u003c\/p\u003e\n\u003cp\u003eGood Gm = 700-800\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e(Filament=5V @ 250ma, Vplate max=135V)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e- Crosley C5 1926\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":553237501,"sku":"01A","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/products\/01anat.jpg?v=1571438784"},{"product_id":"e88cc-6922-amperex-usa-v1","title":"(!!!) (nice single) USN-6922=E88CC Amperex USA gold pins used\/like new 1962 (16\/12.8ma)","description":"\u003cp\u003e1 low noise tube) USN-6922=E88CC Amperex USA gold pins used\/like new (7L8-*2L=1962) in white box; recommended for mic, linestage\u003c\/p\u003e\n\u003cp\u003e1 section) 16.0ma Gm=12,800\u003c\/p\u003e\n\u003cp\u003e1 section) 12.8ma Gm=11,500\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eUSN=US Navy\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e(very open, airy, transparent, detailed, and articulate bass with very good triode section matching and low noise)\u003cbr\u003e\u003cbr\u003e- Aesthetix Io phono stage\u003cbr\u003e- CAT SL-1\u003cbr\u003e- Audible Illusions\u003cbr\u003e- Audio Research\u003cbr\u003e- ARC PH-5 phono\u003cbr\u003e- Herron VTSP-2 preamp\u003cbr\u003e- EAR\u003c\/p\u003e\n\u003cp\u003e- Kora Hermes II Tube DAC\u003cbr\u003e- Decco Integrated amp\u003cbr\u003e- Lector\u003cbr\u003e- Manley Steelhead\u003cbr\u003e- Ear Acute\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":553434321,"sku":"6922","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/1_97a0279d-aeb2-4c58-bccd-d8d89fab3e6a.jpg?v=1728081912"},{"product_id":"6cs7-rca-pair-2","title":"(!!!) (Best Pair) 6CS7 RCA gray plates NOS 1970 era (20\/10.6ma and 21\/12.2ma)","description":"\u003cp\u003e1 matched pair) 6CS7 RCA NOS tall gray ribbed plates 1970 era\u003c\/p\u003e\n\u003cp\u003e1 tube) 20ma\/10.6ma Gm=4300\/3000\u003c\/p\u003e\n\u003cp\u003e1 tube) 21ma\/12.2ma Gm=4700\/3100\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eMatched on Amplitrex\u003c\/p\u003e\n\u003cp\u003eGood Ma triode #1 = 20ma Good Gm = 4000-4500\u003c\/p\u003e\n\u003cp\u003eGood Ma triode #2 = 10ma, Good Gm = 2000-2200\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003efor:\u003c\/p\u003e\n\u003cp\u003eLeben CS 600 integrated amp\u003cbr\u003eLeben CS 660P power amp\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":561103077,"sku":"6CS7rca","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/3_271056ce-5174-41dd-b99a-ebacde166fb2.jpg?v=1775802697"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/collections\/preamp-coll-172.jpg?v=1389474876","url":"https:\/\/tubeworldexpress.com\/collections\/preamp.oembed?page=161","provider":"Tube World Express","version":"1.0","type":"link"}