Delco Number Type 80 Vacuum Tube Rectifier Black Plates Engraved Base Shoulder ST Shape Hanging Filaments OL 5210 This matched trio of RCA

This matched trio of RCA 5Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

(New US-made 6V6s typically test with plate current from the mid- teens to mid 30s with transconductance from 2300 micromhos or so

These six US-made 5U8 tubes tested to spec on our Paul Hart-calibrated TV7/U

It has very light surface noise

new in box Sylvania 38HE7 tube tested to spec on our Paul Hart-calibrated Hickok TV7/U

Delco Number Type 80 Vacuum Tube Rectifier Black Plates Engraved Base Shoulder ST Shape Hanging Filaments OL 5210 This matched trio of RCAThis Delco type 80 rectifier tube was tested on our Paul Hart calibrated TV7 U. It measured 45 40 where minimum (65%) is 40 40 and 100% is 62 62. It has a dimpled sheet getter; mica snubbers; a silkscreened base; hanging filaments and outstanding flashing. 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