Matched Pair RCA 6F6 JANCRC6F6 VT-66 Vacuum Tubes Milspec NOS-Testing Nagrania XL 0235 This lot of three US-made

This lot of three US-made 7F7 tubes was tested on our Paul Hart-calibrated TV7/U and measure as follows:

GE-LABELED 6AQ8 / ECC85 tube was tested on our Paul Hart-calibrated TV7/U for shorts

5 record cleaner and then played it on my Rega Planar Three

Transconductance measured 32 for Tube One and 33 for Tube Two where minimum (65%) is 25

They are still stapled in their boxes

Matched Pair RCA 6F6 JANCRC6F6 VT-66 Vacuum Tubes Milspec NOS-Testing Nagrania XL 0235 This lot of three US-madeThis new old stock testing matched pair of milspec RCA JAN CRC 6F6 VT 66 tubes was tested on our Maxi Matcher 325 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 27. 1 milliamps' plate current and measured 2060 micromhos while Tube Two measured 27. 2 2160 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s. These tubes both have 743 date