Matched Quad RCA 6FQ7 / 6CG7 Vacuum Tubes 35Z4GT Octal T04 The spine is in fine

The spine is in fine shape with no loose pages and the dust jacket is without nicks or tears

This matched pair of milspec RCA JAN-CRC-6N7 / 6N7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Sperry-BRANDED (SPL) 6V6GT output tubes was tested on our Maxi-Matcher 2 in Real World conditions with 400 volts on the plates and a bias of -36 volts for shorts

new in box GE 12CX6 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA 6AU4GTA tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Quad RCA 6FQ7 / 6CG7 Vacuum Tubes 35Z4GT Octal T04 The spine is in fineThis 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 67 73 while Tube Two measured 69 68. Tubes Three and Four measured 69 69 and 72 69, respectively, where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods; ladder plates; side D getters and excellent flashing. As I write, I am playing