Cunningham 25Z5 Vacuum Tube Valve Narrow Bottle Gebraucht RCA Octal Tube Three measured 27

Tube Three measured 27

they were very brittle

both with current readings of 34 and transconductance of 3520

I played them in my Alan Eaton single-ended 45 amplifier (as an "excellent" 6SN7 substitute according to Antique Electronic Supply's "Tube Substitution Guidebook") and they sound outstanding

Cunningham 25Z5 Vacuum Tube Valve Narrow Bottle Gebraucht RCA Octal Tube Three measured 27This Cunningham narrow bottle 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: 53 53 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.