Matched Pair RCA Clear Top 7AU7 Vacuum Tubes Valves NOS NIB 6SN7 Substitute With Adapters February 14 2024 It measured 69/65 where minimum

It measured 69/65 where minimum (65%) is 50/50 and 100% is 77/77

new in box Raytheon 6DS4 nuvistor tube tested to spec on our Paul Hart-calibrated TV7/U

They have 7-09 188-5 and 630 188-5 date/provenance codes

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 It measured 69/65 where minimumThis 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