3 Sylvania Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Three Gebraucht 50L6 They are not suitable for

They are not suitable for guitar amp application as they are somewhat microphonic

I have played it in my Musical Paradise 301 MK 3 with an adapter (not included) as a 6SJ7 substitute and it sounds excellent -- airy with excellent dynamics and signal bandwidth

This new old stock-testing matched pair of RCA clear top 12HG7 tubes was tested on our Paul Hart-calibrated TV7/U (on the 12BY7 setting) for shorts

(New 6SN7s typically test within a standard deviation of 2600 micromhos

Tube Four: 34/2240 where new/nominal is within one standard deviation of 1900

3 Sylvania Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Three Gebraucht 50L6 They are not suitable forThese three Sylvania plate number 78 tube were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 44, 46 and 52 where minimum is (65%) is 36 and 100% is 55 and 100% is 55. 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