{"product_id":"pair-4-56-sylvania-black-plate-nos-1940s-branded-western-electronics-1940s-one-tube-has-slightly-tilted-glass-and-plate-5-4ma-and-5-4ma","title":"(!!) (Pair #4) 56 Sylvania black plate NOS 1940's branded Western Electronics 1940's one tube has slightly tilted glass and plate (5.4ma and 5.4ma)","description":"\u003cp\u003e1 pair) \u003cspan\u003e56 Sylvania black plate NOS 1940's branded Western Electronics 1940's\u003c\/span\u003e original boxes, 4 metal prongs on top mica, same internals\u003c\/p\u003e\n\u003cp\u003e1 tube) 5.4ma Gm=1400\u003c\/p\u003e\n\u003cp\u003e1 tube) 5.4ma Gm=1500 slightly tilted glass - see photo\u003c\/p\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003caddress\u003e\u003cem\u003e \u003c\/em\u003e\u003c\/address\u003e\u003caddress\u003e\u003c\/address\u003e\u003caddress\u003e(Vfilament = 2.5 volts)\u003c\/address\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eAmplitrex Test:\u003c\/p\u003e\n\u003cp\u003eVplate=250V\u003c\/p\u003e\n\u003cp\u003eVgrid=-13.5V\u003c\/p\u003e\n\u003cp\u003eIplate good range = 4.5-5.5ma\u003c\/p\u003e\n\u003cp\u003eGm=1400\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003e- Inspire LP-27A\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Tube World","offers":[{"title":"Default Title","offer_id":49087103729916,"sku":"56pr","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0333\/7633\/files\/4_8352a56d-df44-4f61-8708-17ea52e2b5a1.jpg?v=1778620577","url":"https:\/\/tubeworldexpress.com\/products\/pair-4-56-sylvania-black-plate-nos-1940s-branded-western-electronics-1940s-one-tube-has-slightly-tilted-glass-and-plate-5-4ma-and-5-4ma","provider":"Tube World Express","version":"1.0","type":"link"}