3 Sylvania Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Three Gebraucht 50L6 Tube Four: 34/2240 where new/nominal

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

These tubes have gray coated bottles

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

These seven Philco number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

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

3 Sylvania Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Three Gebraucht 50L6 Tube Four: 34/2240 where new/nominalThese 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