Matched Pair General Electric GE Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Twentyseven TV7 These tubes have top and

These tubes have top and side black / dark-gray bottles

(New 6SN7s typically test from 2600 micromhos and the Jackson expresses this in terms of a percentage

The Ken-rad's base is loose

This book is in very good condition

new in box RCA 13GF7 13GF7A tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE Black Plate 6CG7 6FQ7 Vacuum Tubes With Shields Twentyseven TV7 These tubes have top andThis pair of GE black plate 6CG7 6FQ7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 61 60 while Tube Two measured 68 68 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods and top, harp shaped getters and anode radiators for cooler operation and longer tube life. There is also a shield between the triodes for reduced cross