Telefunken RE 26DC Space Charge Tetrode1920
The RE 26 used a 4 volt tungsten filament and had a rated plate voltage of 12 to 18 volts.
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The RE 26 used a 4 volt tungsten filament and had a rated plate voltage of 12 to 18 volts. 
Click the back button on your browser to return to the thumbnails