Matched Quad Sylvania 7B6 Vacuum Tubes NOS-Testing Gray Silver Glass This Silvertone 5Y3GT black plate

This Silvertone 5Y3GT black plate rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

copiously-illustrated book is in excellent condition

new in box Mullard-MANUFACTURED

Transconductance measured 41/42 where minimum (65%) is 21

Matched Quad Sylvania 7B6 Vacuum Tubes NOS-Testing Gray Silver Glass This Silvertone 5Y3GT black plateThis 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. Tubes Three and Four measured 1100 and 1150, respectively nominal is within a standard deviation of 1100. All four tubes' diodes tested fine as well. 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