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

(New US 6L6GCs typically test with plate current from the low 20s to mid 30s with transconductance from 2200 micromhos or so

new in box Philco 25CU6 / 25BQ6 / 25BQ6GTB tube -- and another just like it -- tested to spec on Paul Hart-calibrated TV7/U

dimpled-sheet getters and two additional support rods per tube for increased rigidity and lowered microphonics

I have played it in my Alan Eaton singe-ended 45 amplifier (at 6

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.