Sylvania 6B4 6B4G Vacuum Tube Valve Output Tube Triode High Fidelity P-1100 This new old stock-testing matched

This new old stock-testing matched pair of RCA 6FQ7 / 6CG7 dual triodes was tested on our TV7/U for shorts

This new old stock-testing Silvertone round plate type 56 triode was tested on our Paul Hart-calibrated TV7 for shorts

These mesh plate National Union number 78 tube were tested on our Paul Hart-calibrated TV7/U for shorts

This lot of four RCA 50Y6 tubes tested to spec on our Paul Hart-calibrated TV7/U

63-29 188-20 date/EIA codes

Sylvania 6B4 6B4G Vacuum Tube Valve Output Tube Triode High Fidelity P-1100 This new old stock-testing matchedThis Sylvania 6B4G tubes was tested on our Hickok Paul Hart calibrated TV7 U for transconductance, shorts and gas. There was no shorts or gas. It measured 54 for minimum (65%) is 38 and 100% is 58. It has 0 26 date codes; perforated plates; a dimpled sheet getter 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