Matched Pair RCA Clear Top 7AU7 Vacuum Tubes Valves NOS NIB 6SN7 Substitute With Adapters February 14 2024 Both are acid-etched

Both are acid-etched

These tubes have black plates

Transconductance measured 50 for Tube One and 54 for Tube Two where minimum (65%) is 40

It has the nostalgic shoulder / Coke bottle glass envelope

Matched Pair RCA Clear Top 7AU7 Vacuum Tubes Valves NOS NIB 6SN7 Substitute With Adapters February 14 2024 Both are acid-etchedThis 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