Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes NOS NIB

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes NOS NIBThis new old stock, new in box matched pair of RCA 6FQ7 6CG7 dual triodes was tested on our TV7 U for shorts, gas and transconductance. There were no shorts or gas and their readings are as follows: Tube One measured 82 76 while Tube Two measured 82 78 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods; ladder plates and side D getters. I played them with adapters (not included) in my Radio Craftsmen RC 2 monoblocks

This new old stock-testing Tung-Sol number / type 38 tube tested 40 on our Paul Hart-calibrated TV7/U where minimum (65%) is 26 and 100% is 40

There were no shorts or gas and they measured 44 and 46 where minimum (65%) is 31

And though this tube tests two standard deviations from the mean

large top and small bottom mica spacers and excellent flashing

Tube One drew 19

but the spine is in fine shape with no loose pages

new in box GE 1821A / Z-1879A is still sealed in its plastic baggie

Tube One (Philco-LABELED

a top O-getter

42/44 and 45/46 where minimum (65%) is 33/33 and 100% is 51/51

new in box Sylvania 6LN8 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box GE 1L4 tubes tested to spec on our Paul Hart-calibrated TV7/U