Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes NOS-Testing 17GW6 Octal T11

Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes NOS-Testing 17GW6 Octal T11This new old stock testing, matched pair of GE 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 64 for Tube One and 68 for Tube Two tubes where minimum (65%) is 40. They have NU 188 5 and 3 09 188 5 date provenance codes, respectively. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. WE HAVE SCORES OF THOUSANDS OF

These three US-made milspec VR-150 / VT-139 / 0D3A tubes tested to spec in our Hickok 800

It was made in Japan

This new old stock-testing Svetlana 6550B / 6P27 perforated plate output tube was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -48 volts for shorts

I am playing them as I write in on of my Sound Craftsmen RC-2 monoblock amplifiers with RCA Living Stereo's CD of Bartok's "Concerto For Orchestra

new in box US-made 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box Philco 7C5 tube tested to spec on our Paul Hart-calibrated TV7/U

This GE 30MB6 tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 33 for Tube One and 33 for Tube Two where minimum (65%) is 26

One is an early 1X2

One can adjust the time

These tubes have mediocre-to-fair and nice flashing

Transconductance measured 8800 micromhos and late current draw was 48