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This is an indirectly heated UHF triode from 1941.

It was made by Lorenz in Germany and the plastic knob indicates a military valve designed for rapid replacement in the field.

The triode is mounted horizontally and the grid extends beyond the width of the anode.

The Type designation on the glass and probably a date of 1943.

The base pins are shaped at the ends to fit into locking springs of the special valve-holder.

The Lorenz logo is pressed into the glass base.

The top knob for easy replacement.

With a little enhancement the lettering becomes clearer.

The wide glass tube envelope is 32 mm in diameter, and including the base pins is 33 mm tall.

Reference: Data-sheet. Type RD12Ta was first introduced in 1939. See also 1939 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.