General Electric GE 25Z5 Vacuum Tube Valve 6BK4B Triode these tubes will perform excellently

these tubes will perform excellently

Transconductance measured 64 for both tubes where minimum (65%) is 40

They measured 85/66 for Tube One and 85/70 for Tube Two where minimum (65%) is 57/57 and 100% is 88/88

Transconductance measured 49

rounded plates and excellent flashing

General Electric GE 25Z5 Vacuum Tube Valve 6BK4B Triode these tubes will perform excellentlyThis GE 25Z5 tube was tested on our Paul Hart calibrated TV7 U for emissions, shorts and gas. There were no shorts or gas and it measured as follows: 54 52 where minimum (65%) is 40 40 and 100% is 62 62. IN 2021 WE PURCHASED 150,000 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 DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST OF THE TUBES WE