RCA 6U8 6U8A 6KD8 Vacuum Tube Valve NOS NIB US-Made Nonal Tube One measured 73/75 while

Tube One measured 73/75 while Tube Two measured 75/76 where minimum (65%) is 56/56 and 100% is 87/87

Three of these four new old stock

This perfectly-matched pair of RCA Radiotron type 76 triodes was tested on our Paul Hart-calibrated TV7/U for shorts

This matched pair of OTK-MANUFACTURED black glass 6V6GT output tubes was tested on our Maxi-Matcher 2 for shorts

RCA 6U8 6U8A 6KD8 Vacuum Tube Valve NOS NIB US-Made Nonal Tube One measured 73/75 whileThis new old stock, new in box RCA 6U8A (ECF82 6AX8 5KD8 6KD8) pentode triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 96 78. Minimum (65%) is 57 57 and 100% is 88 88. As I write, I am playing it using an adapter (not included) in our Dynaco Stereo 70. It sounds great with Pink Floyd's "Obscured By Clouds," replicating this album's nuances and dynamic range with