Matched Pair General Electric GE 6FQ7 / 6CG7 Vacuum Tubes NOS NIB Copper Support Rods Top Filaments

Matched Pair General Electric GE 6FQ7 / 6CG7 Vacuum Tubes NOS NIB Copper Support Rods Top FilamentsThis new old stock, new in box matched pair of GE MANUFACTURED 6FQ7 6CG7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One (RCA LABELED) measured 76 80 while Tube Two measured 78 80 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have copper support rods; top O getters, gray ladder plates; top filaments for a nice light show; three horizontal holes

new in box (for Tube Two) aesthetically-matched pair of gray glass RCA 12SL7GT dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

This new old stock-TESTING matched pair of RCA 6F6G tubes was tested on our Maxi-Matcher 325 volts on the plates and a bias of -36 volts for shorts

Transconductance measured 41/42 where minimum (65%) is 21

I have played them in my Sound Craftsmen RC-2 monoblock amplifiers with adapters (not included) and they sounded outstanding

6 dB (-92 dB is the Maxi-Matcher's noise floor)

The 7025 has somewhat-different gain characteristics than the standard 12AX7

Otherwise it is sold as-is with no returns

new in box GE 6AC7 tubes tested to spec on our Paul Hart-calibrated TV7/U

The GM-LABELED ones all have 312 Sylvania EIA codes

They were Groove Tube-matched both with number 6 ratings

Thes three new old stock

NO REFUNDS IN SUCH CASES