{"product_id":"ef804s-telefunken-v1","title":"(!!!!) (BEST SINGLE) EF804S Telefunken Germany \u003c\u003e bottom NOS 1961 (4.0ma) (Highest mA and Gm) (V72 \/ V76 preamp)","description":"\u003cp\u003e\u003cstrong\u003eEF804S Telefunken Germany \u0026lt;\u0026gt; bottom NOS 1961 from factory sealed box\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e4.0ma\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e Gm=2400\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong\u003eFactory Selected (S) for low noise\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTested on Amplitrex\u003c\/p\u003e\n\u003cp\u003eVplate=250V\u003c\/p\u003e\n\u003cp\u003eVscreen=140V\u003c\/p\u003e\n\u003cp\u003eVgrid=-2V\u003c\/p\u003e\n\u003cp\u003eGood Ma = 2.8-3.2ma\u003c\/p\u003e\n\u003cp\u003eGood Gm = 1800-2000\u003c\/p\u003e\n\u003cp\u003e(Special Quality 10,000+ Low Noise Pentode for microphones)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch1\u003eGeneral Information\u003c\/h1\u003e\n\u003cp\u003e(Special Quality 10,000+ Low Noise Pentode for microphones)\u003c\/p\u003e\n\u003cp\u003eHISTORY:\u003cbr\u003e-------\u003cbr\u003eIn 1951 Telefunken started the 800 Series tube design and offered their improvement to the EF12 design; the EF804S is an identical version of the EF40\/EF86 but with a\u003c\/p\u003e\n\u003cp\u003edifferent pin layout that offered less cross talk from the 1950 standard AC heated filament. They also used an improved cathode base material which is a nearly microphonic-proof construction with a cathode coating. This tube was mainly used\u003c\/p\u003e\n\u003cp\u003efor the AEG\/Telefunken Magnetophone production, but evolved into much of the professional studio equipment of the time. First the V72 was re-equipped with this state of the art Telefunken EF804S audio tube made in their Berlin and Ulm production. In 1967 in London, England, producer George Martin started to use EF804S equipped V72 pre amps for THE BEATLES ALBUM \"SARGENT PEPPER\" .\u003c\/p\u003e","brand":"Tube World","offers":[{"title":"EF804S Telefunken GErmany \u003c\u003e NOS 1961","offer_id":41322365255844,"sku":"EF804S","price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/7_1_f02b0119-6deb-4b5e-a976-dc44fbbed36d.jpg?v=1782189947","url":"https:\/\/tubeworldexpress.com\/products\/ef804s-telefunken-v1","provider":"Tube World Express","version":"1.0","type":"link"}