Matched Pair Sylvania Black Plate 12BY7 12BY7A Vacuum Tubes Valves

Matched Pair Sylvania Black Plate 12BY7 12BY7A Vacuum Tubes ValvesThis matched pair of Sylvania black plate 12BY7 12BY7A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 54 while Tube Two also measured 54. (Minimum (65%) is 46 and 100% is 71. These tubes have black plates; chamfered O getters and rectangular radiators for cooler operation and longer tube life. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY

3 dB / -84

milspec Sylvania GE JAN-CHS-1P5GT/G tube tested to spec on our Paul Hart-calibrated TV7/U

One is Wards -branded and the other is Zenith

53/50 and 60/61 where minimum (65%) is 38/38

These seven new old stock

This new old stock-testing matched pair of milspec RCA metal bottle JAN-CRC-6V6 output tubes was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -36 volts for shorts

black ladder plates

new in box RCA 12A8GT -- and two other similar -- tested to spec on our Paul Hart-calibrated TV7/U

This beautiful new old stock-testing Sylvania-MANUFACTURED

This black plate Sylvania 5Y3GT rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

54/54 and 54/54 where minimum (65%) is 40/40 and 100% is 62/62

The spine is in fine shape with no loose pages and APPEARS to be leather-bound