Matched Pair Sylvania 6DE4 Vacuum Tube Rectifiers OM2 These tubes have crenelated mica

These tubes have crenelated mica spacers

This RCA Black Plate 7AU7 tube was tested on our Hickok 600A for shorts

Tube Two measured 22/2460

Transconductance: 2312 / 2291

It is dead quiet when the preamp is muted and have excellent frequency response and dynamics

Matched Pair Sylvania 6DE4 Vacuum Tube Rectifiers OM2 These tubes have crenelated micaThis matched pair of Sylvania 6DE4 rectifier tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. There were no shorts or gas. They measured 73 and 73, respectively, where minimum (65%) is 50 and 100% is 77. They have gray plates; 312 66 38 158 and da EGD provenance date codes, respectively; short bases; side O getters and crenelated, rectangular top and bottom spacers. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S