{"product_id":"rca-6680-12au7-12au7a-ecc82-vacuum-tube-50591","title":"RCA 6680 12AU7 12AU7A ECC82 Vacuum Tube Valve Industrial Version NOS-Testing Perfect For Univalve And Bottlehead","description":"\u003cp\u003eThis new old stock-testing RCA 6680 \/ 12AU7A \/ ECC82 dual triode was tested on our Paul Hart-calibrated TV7\/U for shorts, gas and transconductance. There were no shorts or gas. \u003c\/p\u003e\n\u003cp\u003eTransconductance measured a nicely-balanced 92\/95 where minimum (65%) is 56\/56 and 100% is 87\/87. \u003c\/p\u003e\n\u003cp\u003eThe 6680 is the industrial version of the 12AU7A. It has gray 12MM plates; excellent flashing for an extremely-hard vacuum and extended tube life and a top-O getter.\u003c\/p\u003e\n\u003cp\u003eI have played it in my Bottlehead headphone amplifier and it sounds outstanding. It is dead quiet when the volume is muted and has excellent frequency response, sound-staging, and dynamics.\u003c\/p\u003e","brand":"Lowtechelec","offers":[{"title":"Default Title","offer_id":62839928127647,"sku":null,"price":22.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/5344\/9631\/files\/il_fullxfull.6628121484_es37_da5fc40c-4580-4546-82f5-35c22cc5fc0b.jpg?v=1785311719","url":"https:\/\/lowtechelec.com\/products\/rca-6680-12au7-12au7a-ecc82-vacuum-tube-50591","provider":"Lowtechelec","version":"1.0","type":"link"}