Matched Pair Sylvania 7N7 Vacuum Tubes 6GT5 Compactron top O getters and large

top O getters and large anode radiators for cooler operation and extended tube life

new in box RCA 13GF7 13GF7A tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 36/36 for Tube One and 48/48 for Tube Two where minimum (65%) is 32/32

Tube One measured 75/86 while Tube Two measured 79/79 where minimum (65%) is 50/50 and 100% is 77/77

Matched Pair Sylvania 7N7 Vacuum Tubes 6GT5 Compactron top O getters and largeThis matched pair of Sylvania 7N7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they tested as follows: Tube One: 71 69 and; Tube Two: 71 74 (Minimum (65%) is 50 50 and 100% is 77 77. They have black wing plates, beautiful flashing and round bottom mica spacers. I have played them (with adapters, not included) in my AC heated Radio Craftsmen RC 2 mono block amplifiers