3 US-Made Number 27 #27 Vacuum Tubes Engraved Base Mesh Plate Thimble GetterLot Of Three AL8500 AL 8500 SD new in box GE 6DS4

new in box GE 6DS4 tube tested to spec on our Paul Hart-calibrated TV7/U

copper support rods and graphite coatings for even electrostatic charge distribution and

Mullard-MANUFACTURED 4HE7 / LF183 tube tested to spec on our Paul Hart-calibrated TV7/U

double D getter

red tip (low noise) 6CG7 / 6FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

3 US-Made Number 27 #27 Vacuum Tubes Engraved Base Mesh Plate Thimble GetterLot Of Three AL8500 AL 8500 SD new in box GE 6DS4This lot of three US made Type 27 227 triodes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 20, 36 and 42, respectively, where minimum (65%) is 25 and 100% is 38. The tubes have round mesh plates; hot stamped bases and excellent flashing. Three have thimble getters while Tubes Three and Four have dimpled sheet getters. WE HAVE SCORES OF THOUSANDS OF VACUUM