Matched Pair Philips Miniwatt PCF80 9U8 Vacuum Tubes Valves JAN-CNU-807 Milspec This new old stock-testing Svetlana

This new old stock-testing Svetlana 6550B / 6P27 perforated plate output tube was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -48 volts for shorts

Transconductance measured 65/34

These five US-made GE 12AQ5s were tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance was 1670 for Tube One and 1570 for Tube Two where new/nominal is within one standard deviation of 1900

Date Codes: 1-43 and NK

Matched Pair Philips Miniwatt PCF80 9U8 Vacuum Tubes Valves JAN-CNU-807 Milspec This new old stock-testing SvetlanaThis matched pair of Philips Miniwatt PCF80 9U8 tubes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. They measured 84 74 for Tube One and 87 73 for Tube Two where minimum (65%) is 57 57 and 100% is 88 88. 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 DO NOT