Matched Pair RCA 12SL7 12SL7GT Black Plate Clear Bottle Vacuum Tubes NOS NIB 6BS8 Nonal T22 This new old stock-testing RCA

This new old stock-testing RCA clear top 6CG7 / 6FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Menin" by Mercury Living Presence

This Philco 5Y4G rectifier tube tested 54/49 where minimum (65%) is 40/40 and 100% is 62/62

but has GE 188-5 and a sutured top

(New 12AU7s typically test within one standard deviation of 2200 micromhos

Matched Pair RCA 12SL7 12SL7GT Black Plate Clear Bottle Vacuum Tubes NOS NIB 6BS8 Nonal T22 This new old stock-testing RCAThis new old stock, new in box, perfectly matched pair of RCA black plate, clear bottle 12SL7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they test as follows: Tube One Transconductance: 45 45 Tube Two Transconductance: 45 45 12SL7 bogey: Minimum (65%) is 32 32 and 100% is 49 49 Physical Characteristics: Bases: tall Bottles: medium height Date Codes: 1 43 and NK EIA