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The RL12T1 is an indirectly heated short wave triode with a 12.6 Volt heater and intended for operation in the low UHF region.

It was made for the German Wehrmacht and so was intended for military communications.

The internal coating on the glass obscures the inner details.

The base is of hard glass.

The thin glass tube envelope is 16 mm in diameter and, excluding the De6 base pins, is 54 mm tall.

Reference: Data-sheet. Type RL12T1 was first introduced in 1937. See also 1937 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.