3 US-Made Number 27 #27 Vacuum Tubes Engraved Base Mesh Plate Thimble GetterLot Of Three AL8500 AL 8500 SD Mullard-MANUFACTURED 4HE7 / LF183 tube

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

double D getter

Tube One measured 30 while Tube Two measured 32 where minimum (65%) is 22 and 100% is 49

but tests on the low side for a new tube

3 US-Made Number 27 #27 Vacuum Tubes Engraved Base Mesh Plate Thimble GetterLot Of Three AL8500 AL 8500 SD Mullard-MANUFACTURED 4HE7 / LF183 tubeThis 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