Cunningham 6A4 Vacuum Tube Valve Five Eighths Wave new in box RCA 7B6

new in box RCA 7B6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 28 while Tube Two measured 29 where minimum (65%) is 22

They tested (from left to right) as follows: 38

vertical support rods and triple mica spacers for lowered microphonics and

It is suitable for 211

Cunningham 6A4 Vacuum Tube Valve Five Eighths Wave new in box RCA 7B6This Cunningham 6A4 tube was tested our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 73 where minimum (65%) is 50 and 100% is 77. It has a dimpled sheet getter, steel plates and a top, crenelated, round mica spacer. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU