Matched Pair RCA Clear Top 7AU7 Vacuum Tubes Valves NOS NIB 6SN7 Substitute With Adapters February 14 2024 new in box Raytheon 6DS4

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

Both are acid-etched

new in box RCA 6JU8A tubes tested to spec on our Paul Hart-calibrated TV7/U

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

mica snubbers for increased rigidity and lowered microphonics and excellent flashing

Matched Pair RCA Clear Top 7AU7 Vacuum Tubes Valves NOS NIB 6SN7 Substitute With Adapters February 14 2024 new in box Raytheon 6DS4This 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