Raytheon 6F6 6F6G Vacuum Tube ST Shoulder Shape NOS-Testing

Raytheon 6F6 6F6G Vacuum Tube ST Shoulder Shape NOS-TestingThis NOS testing Raytheon 6F6G output tube was tested on our Maxi Matcher with 325 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. It drew 23. 8 milliamps' plate current and measured 1800 micromhos while Tube Two measured 27. 7 1950 where new 6F6s measure from approximately 2000 micromhos or so with plate current draw in the 20s. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT

Transconductance (TV7/U): 54/51

I have played it in my Musical Paradise 301 MK 3 with an adapter (not included) as 6SJ7 substitutes and it sounds great

I am playing them as I write in my Musical Paradise MP-301 MK3 and they sound excellent

This Tung-Sol 0B3 / OB3 tube tested to spec on our Paul Hart-calibrated TV7/U

stellar flashing

top mica spacer with mica snubbers

This NOS-testing National Union 6F6G output tube was tested on our Paul Hart-calibrated TV7/U for shorts

new in box GE 12FX8A tubes tested to spec on our Paul Hart-calibrated TV7/U

This tube has an acid-etched bottle

I am playing it in my Bottlehead Crack headphone amp and it sounds great

Tube One measured 66/71 while Tube Two measured 68/67

Transconductance: 2310 micromhos Transconductance: 2130 micromhos