Zenith 5Y4 5Y4G Vacuum Tube Black Plate Rectifier Shoulder ST-Shape Hanging Filaments Engraved Base Stamped Base These tubes have gray plates

These tubes have gray plates

new in box RCA 6U10 tube tested to spec on our Paul Hart-calibrated TV7/U

gas and transconductance on our Paul Hart-calibrated TV7/U as well as a Hickok and a Superior

I can't tell you how they sound as we don't have any equipment that runs them

new in box RCA 17KV6 tubes tested to spec on our on our Paul Hart-calibrated TV7/U

Zenith 5Y4 5Y4G Vacuum Tube Black Plate Rectifier Shoulder ST-Shape Hanging Filaments Engraved Base Stamped Base These tubes have gray platesThis Zenith 5Y4G rectifier tube tested 57 54 where minimum (65%) is 40 40 and 100% is 62 62. It has the nostalgic shoulder Coke bottle glass envelope; hanging filaments; a phi shaped, top mica spacer; an engraved base; a bottom, dimple, sheet getter; excellent flashing and smooth, black plates. 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