The RM-201 is a "Permatron" controlled rectifier, of triode configuration with argon fill. The output voltage can be controlled either by a magnet attached to the bulb about 1/3 of the way up from the base, or by an internal "collector" electrode acting as a grid. Filament uses 2.5 V @ 3.5 A. Peak reverse voltage is 350; output current is 100 mA.
There was a larger Permatron, the RM-208, which is basically an 866A mercury rectifier with collector added, and carrying 866A ratings. An article in "Electronics," April 1939, covers these tubes.
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