2 National Union NU 6U7 Vacuum Tubes Valves Lot of Two

2 National Union NU 6U7 Vacuum Tubes Valves Lot of TwoThis lot of two National Union 6U7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. They tested 44 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 SHIPPING EXCEPT MEDIA

Transconductance measured 74 for Tube One and 76 for Tube Two where minimum (65%) is 58

Both tubes measured 72 where minimum (65%) is 55 and 100% 85

52 and 58 where minimum (65%) is 40

(New Russian EL84s typically test from the mid 20s to mid 60s with transconductance from 3500 micromhos)

FOUR-STAR REVIEWS OR HAVE LOST A CUSTOMER BECAUSE I REFUSED TO EITHER ISSUE A REFUND FOR A TUBE THAT WENT BAD AFTER IT HAD BEEN USED OR A BUYER KNEW NOTHING ABOUT TUBE REBRANDING AND CLAIMED THAT SOMETHING MADE BY TUNG-SOL AND BRANDED BY EMERSON WAS MADE BY EMERSON

It is dead quiet when the preamp is muted and has excellent frequency response even though this amp was designed for 6SN7s

new in box GE 6JF6 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

straight-bottle bottle variety

Noise: -85

top O getters and nice flashing

new in box RCA 6HV5A tubes tested to spec on our Paul Hart-calibrated TV7/U