4 US-Made 6SH7 Vacuum Tubes Milspec NOS NIB Lot Of Four

4 US-Made 6SH7 Vacuum Tubes Milspec NOS NIB Lot Of FourThese four new old stock, new in box US made 6SH7 tubes tested to spec on our Paul Hart calibrated TV7 U. Two are civilian and two are milspec. This RCA 807 output tube was tested with adapters on our Maxi Matcher 2 for shorts, gas and transconductance with 400 volts on the plates and a bias of 48 volts. There were no shorts or gas. Plate current draw was 19. 8 milliamps while transconductance measured 2440 micromhos. (New 807s typically test from the

tall bottles

vertical gray plates

-- GE 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

There were no shorts or gas and they measured 30

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microphonics and transconductance

Both tubes measured 69 where minimum (65%) is 55

WE PROBABLY HAVE IT

This lot of three Sylvania 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

It is a bit microphonic

new in box Super Silvertone 1J6G tube tested to spec on our Paul Hart-calibrated TV7/U

It measured 42/44 where minimum (65%) is 33/33 and 100% is 51/51