Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing VT-132 T02 T52

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing VT-132 T02 T52This new old stock testing, perfectly matched pair of Sylvania 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 59 for both tubes where minimum (65%) is 40. They have 939 and 252 date codes, respectively. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED,

I have played it in my Alan Eaton single-ended 45 amplifier with an adapter and it sounds outstanding

Tubes Three and Four measured 73/70 and 75/72

new in box 12Q7 / 12Q7GT tubes tested to spec on our Paul Hart-calibrated TV7/U

Kenton-LABELED 14BR11 tubes tested to spec on our Paul Hart-calibrated TV7/U

but I do not recommend using them at any other filament voltage than 12

The diameter across the porcelain is approximately 1

They measured 12/18

5                                                                                                                      Shipping $80

These ten Philco engraved / hot-stamped-base type / number 41 tubes tested as follows on our Paul Hart-calibrated TV7/U:

80/70 and 82/70

They sound terrific and have great bass with sparkling highs and Donald Fagan’s voice is warm and clear as a bell

top chamfered solid-O getters and two additional vertical support rods for increased rigidity and lowered microphonics