Italian Sylvania 12SN7 12SN7GTA Vacuum Tube NOS NIB Vinyl LP MGM Records new in box black plate

new in box black plate Sylvania 6X4 was tested on our Paul Hart-calibrated TV7/U for shorts

36 and 48 where minimum (65%) is 29

5 -- maybe an eight -- out of ten

RCA-MANUFACTURED) and 1350 for Tube Two (Philco-LABELED

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Italian Sylvania 12SN7 12SN7GTA Vacuum Tube NOS NIB Vinyl LP MGM Records new in box black plateThis 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