Cunningham 25Z5 Vacuum Tube Valve Narrow Bottle Gebraucht RCA Octal new in box US-made 6S8GT

new in box US-made 6S8GT tubes tested to spec on our Paul Hart-calibrated TV7/U

they were very brittle

The spine is in fine shape with no loose pages and APPEARS to be leather-bound

This lot of two RCA 25Z5 tubes were tested on our Paul Hart-calibrated TV7/U for emissions

both with current readings of 34 and transconductance of 3520

Cunningham 25Z5 Vacuum Tube Valve Narrow Bottle Gebraucht RCA Octal new in box US-made 6S8GTThis 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.