5 General Electric GE 6SF7 Vacuum Tubes Valves Lot Of Five

5 General Electric GE 6SF7 Vacuum Tubes Valves Lot Of FiveThese five GE 6SF7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They tested as follows: 56 32, 66 35, 74 55, 77 52 and 82 48 where minimum (65%) is 50 40. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS.

These three RCA plate number 78 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

It has an engraved / stamped base

new in box 6AH6 tubes tested to spec on our Paul Hart-calibrated TV7/U

This matched pair of new old stock

gray bottle type / number 41 tubes tested as follows on our Paul Hart-calibrated TV7/U:

This well-written diary details the attempted dehumanization of its author

This happens perhaps once -- maybe twice -- per decade

They measured 46

It teats below spec but should work fine in many applications

Transconductance measured 57 for Tube One and 58 for Tube Two where minimum (65%) is 40

Transconductance measured 82 for Tube One and 84 for Tube Two where minimum (65%) is 58

This matched quad of new old stock-testing Sylvania 7B6 tubes tested 1033 micromhos for Tube One and 1050 for Tube Two on our Hickok 800