10 Philco Number / Type 41 #41 Vacuum Tubes Engraved / Hot-Stamped Bases Lot Of Ten Beverly Sills Transconductance measured 57 for Tube

Transconductance measured 57 for Tube One and 65 for Tube Two where minimum (65%) is 36 and 100% is 55

These GE 1622 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

My chinchilla was a big Jefferson Airplane fan

This Groove Tube GT-ECC83-S / ECC83 / 12AX7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

There were no shorts or gas and they test as follows:

10 Philco Number / Type 41 #41 Vacuum Tubes Engraved / Hot-Stamped Bases Lot Of Ten Beverly Sills Transconductance measured 57 for TubeThese ten Philco engraved hot stamped base type number 41 tubes tested as follows on our Paul Hart calibrated TV7 U: 52, 54, 54, 54 54, 54, 55, 58, 58 and 62 where minimum (65%) is 40 and 100% is 62.