2 Zenith 6U7 Vacuum Tubes Valves Lot of Two 12FX8A Nonal New / nominal transconductance is

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

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

2 Zenith 6U7 Vacuum Tubes Valves Lot of Two 12FX8A Nonal New / nominal transconductance isThese 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