Matched Pair Sylvania 12AV7 Vacuum Tubes Valves Black Plate NOS NIB Stereo C5RS-7694-1 (New US-made 6550s typically test

(New US-made 6550s typically test with plate current from the low 20s to mid 40s with transconductance from 3500 micromhos or so

This new old stock-testing RCA clear top 6CG7 / 6FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

new in box CBS 6AK6 tubes tested to spec on our Paul Hart-calibrated TV7/U

top mica spacer

These five Ken-Rad-MANUFACTURED 6U7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Sylvania 12AV7 Vacuum Tubes Valves Black Plate NOS NIB Stereo C5RS-7694-1 (New US-made 6550s typically testThis matched pair of new old stock, new in box Sylvania black plate 12AV7 dual triodes was tested on our Maxi Matcher for shorts, gas and gain. There were no shorts or gas. Gain (Mu) measured 31. 4 31. 9 for Tube One and 33. 4 31. 3 for Tube Two. (New 12AZ7s typically test within a standard deviations of 33). 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