moor er20

Moorhead ER (1920)
DC Detector Triode
~1920


This version of the Electron Relay has the Moorhead name and a serial number etched in the glass bulb. ER is stamped into the plate. The filament current is lower than the earlier ER's. This tube may be the Type D that was to be produced for Marconi, but no hard evidence has been found to prove the point.

point left Click the back button on your browser to return to the thumbnails