Matched Trio Sylvania 12BY7 12BY7A Vacuum Tubes Cunningham Type 7 and 1830/20

7 and 1830/20

GT and JY date codes

Setchell-Carlson-BOXED 6GV8 / ECL85 tube tested to spec on our Paul Hart-calibrated TV7/U

8 for Tube Two

beefy black plates: three mica spacers for improved mechanical stability and low microphonics

Matched Trio Sylvania 12BY7 12BY7A Vacuum Tubes Cunningham Type 7 and 1830/20This matched trio of Sylvania 12BY7 12BY7A tubes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 54 while Tube Two measured 57. Tube Three measured 58. (Minimum (65%) is 46. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU