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The De Forest DV-5 is an amplifier triode designed with a nominal filament voltage of six volts. The base is the ceramic Isolantite.

The original packing was a printed metal can. It gives the design use as an audio amplifier and had a greater output than the earlier DV-2.

Thanks to Joe Gruber for sending the images.

The wide glass tube envelope is 32 mm in diameter and, excluding the UV base pins, is 99 mm tall.

Reference: Joe Gruber. Type DV-5 was first introduced in 1925. See also 1925 adverts.

Absolute Maximum Operating Conditions^¶