General Electric GE 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate 1S5 Septal T60 They have 4-39 188-5 and

They have 4-39 188-5 and 3-43 188-5 date codes/EIA code

This new old stock-testing matched pair of Shuguang 6L6WGC output tubes was tested on our Maxi-Matcher 2 for shorts

This new old stock-testing Svetlana 6550B / 6P27 perforated plate output tube was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -48 volts for shorts

new in box milspec RCA 6K7 / VT-86 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box US-made 6BA7 tubes tested to spec on our Paul Hart-calibrated TV7/U

General Electric GE 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate 1S5 Septal T60 They have 4-39 188-5 andThis black plate GE 5Y3GT rectifier tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 52 48 where minimum (65%) is 40 40 and 100% is 62 62. It has a top getter, outstanding flashing and a 58 43 188 20 date provenance code. 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