Matched Pair Philco Number Type 78 #78 Vacuum Tubes Valves Engraved Hot-Stamped Base Mesh Plate Engraved Base came from an excellent lot

came from an excellent lot and should work fine

These tubes have acid-etched codes and designations as well as silk-screened 67-05 67-22 188-5 and 68-26 188-5 67-50 production run/provenance codes

60/40 and 64/50 where minimum (65%) is 50/50 and 100% is 77/77

It measured 78/80 where minimum (65%) is 50/50 and 100% is 77/77

on our Paul Hart-calibrated TV7/U where minimum (65%) is 31 and 100% is 48

Matched Pair Philco Number Type 78 #78 Vacuum Tubes Valves Engraved Hot-Stamped Base Mesh Plate Engraved Base came from an excellent lotThis matched pair of mesh plate Philco number 78 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 43 and 44 where minimum is (65%) is 36 and 100% is 55. 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