5 Philco Number Type 37 #37 Vacuum Tubes Valves Black Plate Shoulder ST Shape Lot Of Five Azia Records O getter) measured 46 where

O getter) measured 46 where minimum (65%) is 32 and 100% is 49

This new old stock-testing Sylvania 12SK7GT tube tested 64 on our Paul Hart-calibrated TV7 where minimum (65%) is 48

6 dB / -82

Tube One measured 66/53 while Tube Two measured 67/57 where minimum (65%) is 50/50

5 Philco Number Type 37 #37 Vacuum Tubes Valves Black Plate Shoulder ST Shape Lot Of Five Azia Records O getter) measured 46 whereThese five Philco Type 37 triodes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 18, 20, 26, 30 and 3o where minimum (65%) is 23. They have black dark gray plates; dimpled sheet getters; old fashioned, coke bottle shape glass envelopes and terrific flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER