Matched Pair Sylvania 6DE4 Vacuum Tube Rectifiers OM2 new in box Sylvania 6GS7

new in box Sylvania 6GS7 tubes tested to spec on our Paul Hart-calibrated TV7/U

This new old stock-testing RCA black plate 12AU7A dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

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

These tubes have crenelated mica spacers

Not for use in guitar and bass amps

Matched Pair Sylvania 6DE4 Vacuum Tube Rectifiers OM2 new in box Sylvania 6GS7This 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