Matched Pair RCA Clear Top 12HG7 12BY7 Vacuum Tubes NOS-Testing LP SW 3386 Transconductance measured 3900/4500 micromhos

Transconductance measured 3900/4500 micromhos

There is no mounting hardware or coax

Transconductance measured 2230 micromhos for Tube One (Missing centering pin

There is a crack in the base

There are a total of five 12D4 tubes in this lot

Matched Pair RCA Clear Top 12HG7 12BY7 Vacuum Tubes NOS-Testing LP SW 3386 Transconductance measured 3900/4500 micromhosThis new old stock testing matched pair of RCA clear top 12HG7 tubes was tested on our Paul Hart calibrated TV7 U (on the 12BY7 setting) for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 74 while Tube Two measured 78 where minimum (65%) is 46 and 100% is 71. These tubes have anode radiators for cooler operation and longer tube life; side O getters and excellent flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.