Matched Pair General Electric GE 6FQ7 / 6CG7 Vacuum Tubes Copper Support Rods NOS NIB 6C8 6SL7s can sub for 6SN7s

6SL7s can sub for 6SN7s in some amps but I do not recommend experimenting as they have very-different bias voltages

I’m playing it now in one of my Radio Craftsman RC-2 mono blocks and it sounds great

I am playing it in one of my ArtSound single-ended amplifiers with Steely Dan’s seminal "Aja" album

These matched quad of RCA milspec JRC-6H6 / 6H6 / VT-90 6H6 tubes was tested on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 6FQ7 / 6CG7 Vacuum Tubes Copper Support Rods NOS NIB 6C8 6SL7s can sub for 6SN7sThis 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 (GE MANUFACTURED, ZENITH LABELED) measured 74 76 while Tube Two measured 76 78 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have copper support rods; top O getters, gray ladder plates; excellent flashing and three horizontal holes