Polytron Vierfach-Röhre
DC Quad Triode
~1928 (German)

The Polytron brand tubes were made by Dr. G. O. Spanner, GmbH. This company also produced dual triodes and other tubes under the Delta name. The Vierfach-Röhre used a series filament for the 4 sections which ran at .35 amps at 3.5 volts. The plates and grids were copper, an unusual element material for this time period. An internal shield, in the form of an X was used between the sections. The base was special and would have required a special matching socket.

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