Matched Pair General Electric GE 12BH7 12BH7A Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing CAL-471 RE coke-bottle-shape glass envelopes and terrific

coke-bottle-shape glass envelopes and terrific flashing

This new old stock-testing trio of RCA 6K7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

This matched pair of Philco Type 27 triodes was tested on our Paul Hart-calibrated TV7/U for shorts

The next generation of Groswolds continue their parents' hapless adventures

Matched Pair General Electric GE 12BH7 12BH7A Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing CAL-471 RE coke-bottle-shape glass envelopes and terrificThis new old stock testing matched pair of GE 12BH7A dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 65 69 while Tube Two measured 66 70 where minimum (65%) is 30 30 and 100% is 46 46. These tubes have gray plates; copper support rods; excellent flashing; top harp lyre getters and anode radiators for improved cooling and longer tube life. I have played them