Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes NOS NIB US-Made 105 black and silver bottles and

black and silver bottles and 6-52 188-5 and 3-09 188-5 provenance/date codes

This album sounds bright

This Lansdale (Philco's in-house tube manufacturing arm) 12AU7 / ECC82 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

This tube has a dual-plate structure

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes NOS NIB US-Made 105 black and silver bottles andThis 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