Matched Pair RCA 5U4 5U4GB Vacuum Tubes Rectifier Black Plate Selected Poems This lot of three Sylvania

This lot of three Sylvania 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

5 record cleaner and then played it on my solid state rig which consists of a Rega Planar Three with an Ortofon X5-MC cartridge on an RB-300 tone arm with an Adcom GFP-555 II preamp feeding a Hafler SE240 power amplifier and PSB Alpha near-field monitors

a short base

Both tubes measured 72 where minimum (65%) is 55 and 100% 85

new in box Siemens EBF89 / 6DC8 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair RCA 5U4 5U4GB Vacuum Tubes Rectifier Black Plate Selected Poems This lot of three SylvaniaThis matched pair of RCA 5U4GB rectifier tubes was tested on our Paul Hart calibrated tube tester for shorts, gas and emissions. Tube One tested 54 in Section One and 54 in Section Two as well. Tube Two tested 56 57 where minimum (65%) is 40 40 and 100% is 62 62. They have crenelated rectangular mica spacers; great flashing and side, O getters. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY