Matched Trio General Electric GE 12HG7 12GN7 12GN7A Vacuum Tubes NOS NIB Fat Bottles 6K6GT Black Glass They have engraved / hot-stamped

They have engraved / hot-stamped bases

there are no reference numbers on it

steel support rods and excellent flashing

These four Sylvania 12SG7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Matched Trio General Electric GE 12HG7 12GN7 12GN7A Vacuum Tubes NOS NIB Fat Bottles 6K6GT Black Glass They have engraved / hot-stampedThis matched trio of GE 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 and they measure as follows: 75, 78 and 80 where minimum (65%) is 46 and 100% is 71. These tubes have anode radiators for cooler operation and longer tube life; side O getters; solid saucer getters and excellent top and side flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF