Raytheon 12SN7 12SN7GTA Vacuum Tube Valve Black Plate NOS-Testing 6AC7 Gebraucht

Raytheon 12SN7 12SN7GTA Vacuum Tube Valve Black Plate NOS-Testing 6AC7 GebrauchtThis Raytheon (JAPAN) 12SN7GTA dual triode was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 74 69 where minimum (65%) is 50 50. It has a top O getter; copper support rods; great flashing and black, ladder plates. I have played it in my Alan Eaton singe ended 45 amplifier (at 6. 3 rather than 12. 6 volts) and it sounds terrific. It is dead quiet when the preamp is

Both tested 52/52 where minimum (65%) is 40/40

Transconductance measured 46/49 where minimum (65%) is 25 and 100% is 38/38

new in box GE 6H6 tube tested to spec on our Paul Hart-calibrated TV7/U

There were no shorts and it measured a perfectly-balanced 44/44 where minimum (65%) is 34/32 and 100% is 52/52

This tube looks great

It measured 38/34 where minimum (65%) is 40/40 and 100% is 62/62

It measured 42/49 where minimum (65%) is 50/50 and 100% is 77/77

This matched pair of Sylvania black plate 6CL6 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box Japanese-made 26LX6 tube tested to spec on our Paul Hart-calibrated TV7/U

These two RCA 6JV8 tubes tested to spec on our Paul Hart-calibrated TV7/U

Minimum (65%) is 1430

This matched pair of RCA 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U