3 RCA Number Type 78 #78 Vacuum Tubes Valves Engraved Hot-Stamped Base Mesh Plate Lot Of Three ZG 30260 Z 30262

3 RCA Number Type 78 #78 Vacuum Tubes Valves Engraved Hot-Stamped Base Mesh Plate Lot Of Three ZG 30260 Z 30262These mesh plate National Union number 78 tube were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 36, 38 and 44 where minimum is (65%) is 36. 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

Both tested 52/52 where minimum (65%) is 40/40

It was made in Japan

I just cleaned this LP set on my VPI 16

This matched pair of new old stock-testing General Electric / GE 12SN7 12SN7GTA dual triodes was tested on our Jackson 648 Mutual Conductance tester for shorts

This lot of two GE industrial-grade 1852 (6AC7) tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box RCA 5AM8 tube tested to spec on our Paul Hart-calibrated TV7/U

I am playing them as I write in my Alan Eaton single-ended 45 amplifier with RCA Living Stereo's CD of Bartok's "Concerto For Orchestra

Transconductance: 1541 / 1532

PLEASE INSURE THEM

new in box GE 6AS5 tubes tested to spec on our Paul Hart-calibrated TV7/U

They have shoulder / ST / Coke-bottle bottles and dimpled-sheet getters

They tested to spec on our Paul Hart-calibrated TV7/U