Matched Pair RCA 12SL7 12SL7GT Black Plate Clear Bottle Vacuum Tubes NOS NIB 6BS8 Nonal T22 This Philco 5Y4G rectifier tube

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

Etsy will indicate the quantity remaining

Menin" by Mercury Living Presence

but has GE 188-5 and a sutured top

Matched Pair RCA 12SL7 12SL7GT Black Plate Clear Bottle Vacuum Tubes NOS NIB 6BS8 Nonal T22 This Philco 5Y4G rectifier tubeThis 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