ID this valve.
A power-rectifier, on a 4-pin base with the pins bifurcated, 5V seems to work well as heater voltage.
Indirectly--heated cathodes but with the cathodes strapped to the heaters, which sort-of hints that it is an analog for a directly-heated precursor.
There's a little 'nub' on the bakelite base adjacent to one of the four pins - presumably to give guidance whrn plugging it into its socket.
Intriguingly - the two anode-assemblies are rotationally offset so that they do not face directly towards each-other; this is clearly an attempt to stop them radiating the inevitable anode-dissipation-Watts at each-other.
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I'm the Operator of my Pocket Calculator. -Kraftwerk.
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