Matched Pair RCA Clear Top 7AU7 Vacuum Tubes NOS NIB 6SN7 Substitute With Adapters Digital Oscilloscope This new old stock-testing matched

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

new in box matched trio of GE-MANUFACTURED 12B4A tubes was tested on our Paul Hart-calibrated TV7/U for shorts

but the time can be set

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Matched Pair RCA Clear Top 7AU7 Vacuum Tubes NOS NIB 6SN7 Substitute With Adapters Digital Oscilloscope This new old stock-testing matchedThis 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