Matched Trio Sylvania 12BY7 12BY7A Vacuum Tubes

Matched Trio Sylvania 12BY7 12BY7A Vacuum TubesThis 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

I have played it in my Bottlehead Crack headphone amplifier and it sounds outstanding

new in box GE 6CL6 tubes tested to spec on our Paul Hart-calibrated TV7/U

-- GE 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

I just cleaned this four LP set on my VPI 16

Transconductance readings are 46

This RCA 6DC6 tube tested to spec on our Paul Hart-calibrated TV7/U

There were no shorts or gas and they measured 36/30

These tubes have excellent silkscreening

44 and 48 where minimum (65%) is 30 and 100% is 46

but standard in this variety

new in box US-made 14BL11 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 49/49 where minimum (65%) is 36/36