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

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This RCA black plate 6LQ6 tube tested 80 on our Paul Hart-calibrated TV7/U where minimum is 54 and new is 100

BY TUNG-SOL AND BRANDED BY EMERSON WAS MADE BY EMERSON

Transconductance measured 48 for both where minimum (65%) is 36 and 100% is 55

These four Sylvania 7Q7s tested to spec on our Paul Hart-calibrated TV7/U

It measured 29 and 63/37 where minimum (65%) is 24 40/40 and 100% is 36 and 62/62

Transconductance measured 62 for Tube One and 64 for Tube Two where minimum (65%) is 40

79 and 84 where minimum (65%) is 50

A seven out of ten

Bases: N/A

you're in luck as well

new in box GE 21LU8 tubes tested to spec on our Paul Hart-calibrated TV7/U