Italian Sylvania 12SN7 12SN7GTA Vacuum Tube NOS NIB

Italian Sylvania 12SN7 12SN7GTA Vacuum Tube NOS NIBThis new old stock, new in box Italian Sylvania 12SN7GTA dual triode was tested on our Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured a perfectly balanced 2700 2700 micromhos. (New 6SN7s typically test within a standard deviation of 2600 micromhos; minimum (65%) is 1690). It has copper support rods; staggered gray plates; copious flashing and a large, side D getter. I have played it in one of

oiled and keeping very good time

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

This Zenith 5Y4G rectifier tube tested 57/54 where minimum (65%) is 40/40 and 100% is 62/62

excellent flashing and well-secured bases and bottles that are nice and tight

Special Features: SC 8762 A (World War Two US Army Signal Corps contract codes)

This lot of four North American-made number 78 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

44 and 45 where minimum is (65%) is 36 and 100% is 55

WE HAVE THOUSANDS OF VINTAGE ELECTRONIC ITEMS

This Matsushita 12FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Flashing Quality: good

They measured 85/66 for Tube One and 85/70 for Tube Two where minimum (65%) is 57/57 and 100% is 88/88

This nearly-perfectly matched pair of new old stock-TESTING RCA 6BG6G output tubes was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts