Sylvania 6L6 6L6GC Vacuum Tube Valve For Your Univalve NOS-Testing

Sylvania 6L6 6L6GC Vacuum Tube Valve For Your Univalve NOS-TestingThis new old stock testing Sylvania 6L6GC was tested on our Maxi Matcher 2 for shorts, plate current, transconductance and gas. There was no gas. It tested an outstanding 3000 micromhos with a plate current draw of 30. 9 milliamps where new 6L6GCs typically test with plate current from the low 20s to mid 30s and transconductance from 2200 micromhos or so. It has dual O getters; a crenelated, top mica spacer and a bottom, smooth mica spacer and

Transconductance measured 1800/1750 micromhos for Tube One and 1800/1775 micromhos for Tube Two

I played them in my Alan Eaton single-ended 45 amplifier (as an "excellent" 6SN7 substitute according to Antique Electronic Supply's "Tube Substitution Guidebook") and they sound outstanding

new in box Sylvania 6JH6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 57 for Tube One and 65 for Tube Two where minimum (65%) is 36 and 100% is 55

3 rather than 12

US-manufactured Amperex 7699 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box Zenith 17AY3 / 17AY3A / 17BS3 / 17BS3A tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One drew 16

These ten US-made gray glass 6D6 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

WE HAVE HAD FEWER THAN A DOZEN LESS-THAN-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

I have played it in my Bottlehead Crack headphone amplifier and it sounds great

new in box Westinghouse 17DE4 tubes tested to spec on our Paul Hart-calibrated TV7