Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes NOS NIB Columbia EMI (New US-made 7C5s typically test

(New US-made 7C5s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos or so

This RCA Radiotron number / type 80 rectifier tube was tested on our Paul Hart-calibrated TV7/U

new in box RCA 6AV5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 33 for Tube One and 33 for Tube Two where minimum (65%) is 26

The pressing is quite good with a few pops and crackles and I would give it a 7-7

Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes NOS NIB Columbia EMI (New US-made 7C5s typically testThis matched pair of new old stock, new in box (For Tube One) GE 6SL7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 45 38 while Tube Two measured 42 41 where minimum (65%) is 32 32 49 49. They have steel plates; steel support rods; 59 43 188 5 and 5 48 188 5 date provenance codes; solid top mica spacers; side harp getters; tall bases; medium bottles and