2 Zenith 6U7 Vacuum Tubes Valves Lot of Two 12FX8A Nonal

2 Zenith 6U7 Vacuum Tubes Valves Lot of Two 12FX8A NonalThese two Zenith 6U7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. They tested (from left to right) as follows: 52 and 55 where minimum (65%) is 40 and 100% is 62. 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 SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF

new in box milspec / industrial Philips ECG 6189 JAN-6189W dual triodes with was tested on our Maxi Preamp II for shorts

but still usable especially in experimental situations where the tube might be damaged -- on our Paul Hart-calibrated TV7/U

They tested 51/52

This Super Silvertone 6J7G tube was tested on our Paul Hart-calibrated TV7/U for shorts

This matched pair of Ken-Rad black glass 6K6GT tubes was tested on our Maxi-Matcher tube tester with 325 volts on the plates and a bias of -36 volts

IN WELL OVER 8000 SALES

Date Codes: 1-43 and NK

New / nominal transconductance is within one standard deviation of 1900

new in box National Union 7Y4 tubes in this lot

Dynamic range is excellent as this album goes from ethereal to raucous and back

There are five new old stock

53/52 and 54/54 where minimum (65%) is 40/40