moor er17-1

Moorhead ER (1917 1 fil)
DC Detector Triode
1917


The 1917 version of the ER was normally supplied with a dual filament, but some single filament versions have been seen. As the lower photo shows, the second filament lead has been cut off flush at the press and the usual second lead wire not brought out.

Tube from Jerry Vanicek collection

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