Matched Pair CBS-Hytron 6V6 6V6GT Black Plate Clear Bottle Vacuum Tubes Sylvania NOS NIB new in box RCA 13GF7

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

new in box GE 33GY7A tubes tested to spec on our Paul Hart-calibrated TV7/U

What makes this funny is that a major US defense contractor likely committed a number of felonies by smuggling communist Soviet tubes into the US at the height of the Cold War

I just cleaned this double album on my VPI 16

This matched quad of GE black plate 6CL6 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair CBS-Hytron 6V6 6V6GT Black Plate Clear Bottle Vacuum Tubes Sylvania NOS NIB new in box RCA 13GF7This nearly perfectly matched pair of black plate CBS CBS Hytron 6V6GT output tubes was tested on our Maxi Matcher 2 for shorts, gas and transconductance. There were no shorts or gas. Plate current measured 17. 9 milliamps and transconductance was 2050 micromhos for Tube One. Tube Two measured 18 2100. (New US made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos or so.) They have tall