Matched Pair RCA Clear Top 7AU7 Vacuum Tubes NOS NIB 6SN7 Substitute With Adapters Digital Oscilloscope This RCA Cunningham 6C6 tested

This RCA Cunningham 6C6 tested at 38 on our Paul Hart-calibrated TV7/U where minimum (65%) is 31

The spine is in fine shape with no loose pages and the dust jacket has only a few

This new old stock-testing matched pair of Ken-Rad 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

This lot of eight 6CG7 / 6FQ7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair RCA Clear Top 7AU7 Vacuum Tubes NOS NIB 6SN7 Substitute With Adapters Digital Oscilloscope This RCA Cunningham 6C6 testedThis new old stock, new in box matched pair of RCA Clear Top 7AU7 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 78 73 while Tube Two measured 81 72 where minimum (65%) is 58. I am playing them in my Sound Craftsmen RC 2 monoblock amplifiers with the included adapters and they sound outstanding. They are dead quiet when just the amplifier is running and