8 Philco Number / Type 77 #77 Vacuum Tubes Engraved / Stamped Base Mesh Plate Variety Lot Of Eight 4th Quarter BW49 EIA Factory Codes: none

EIA Factory Codes: none

This matched pair of Sylvania-MANUFACTURED

Transconductance measured 57 for Tube One and 65 for Tube Two where minimum (65%) is 36 and 100% is 55

This milspec RCA 1642 dual triode was tested on our Paul Hart-calibrated TV7/U

8 Philco Number / Type 77 #77 Vacuum Tubes Engraved / Stamped Base Mesh Plate Variety Lot Of Eight 4th Quarter BW49 EIA Factory Codes: noneThese eight Philco number type 77 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. There were no shorts or gas. They tested (from left to right, top to bottom) 25, 30, 31, 32, 32, 33 37 and 39 where minimum (65%) is 31. 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