Matched Pair Sylvania 6DE4 Vacuum Tube Rectifiers OM2 This RCA Black Plate 7AU7

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

This lot of six RCA 6GH8A tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube Two measured 22/2460

This pressing has moderate surface noise audible in quiet passages and in moderate passages

Matched Pair Sylvania 6DE4 Vacuum Tube Rectifiers OM2 This RCA Black Plate 7AU7This 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