The Telefunken RL12 P35 is a German transmitting pentode dating from the WWII era. One of the top caps are clearly marked A for anode and the second top cap is taken to the suppressor grid.
The base is of a bayonet locking type with five small base pins. The skirt hides the electrodes and is indirectly heated with a circular cathode tube.
The picture above shows the valve turned through 90 degrees.
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The wide glass tube envelope is 48 mm in diameter, and excluding the base pins, is 145 mm tall.
References: Data-sheet. Type RL12P35 was first introduced in 1936.
Absolute Maximum Operating Conditions¶
Updated December03, 2012. shape:wide.glass.tube construction:pinch type:pentode age:1940.1950 base: pins:5 pin: