General Electric GE 6U8 6U8A 6AX8 5KD8 6KD8 ECF82 Vacuum Tube Valve NOS NIB Facades Suites perfectly-matched pair of Sylvania 12B4A

perfectly-matched pair of Sylvania 12B4A tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This GE-MANUFACTURED

Both tubes measured 30 where minimum (65%) is 22

new in box RCA 6U8A (ECF82 / 6AX8 / 5KD8 / 6KD8) pentode/triode was tested on our Paul Hart-calibrated TV7/U for shorts

IF A TUBE FAILS AFTER YOU GET IT

General Electric GE 6U8 6U8A 6AX8 5KD8 6KD8 ECF82 Vacuum Tube Valve NOS NIB Facades Suites perfectly-matched pair of Sylvania 12B4AThis new old stock, new in box GE 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