The RV12P2000 is a 'universal' HF pentode, possibly close in design to the American Acorn valve 954. The base has side pins and a knob can be screwed into the end of the base to act as a handle. This base arrangement prevented the stress on the glass to metal seal of the pins that caused problems for the Acorn types.
The RV12P2000 was produced in quantities larger than any other valve for the Wehrmacht. It was used in many stages of a a piece of equipment. The design allowed for it to function in RF stages up to the low VHF and even to generate up to 580 mW of output. It was also found as an oscillator, IF amplifier, audio amplifier and we believe also, in some cases, as a rectifier.
The original metal paint is missing except for a couple of small areas. The paint colour was mid grey. The internal structure is thus now visible. The suppressor grid is tightly wound at the ends and has the usual open helix through the active region of the valve.
The underside of the base showing the pins firmly held and the central threaded hole for the knob if required.
The thin glass tube envelope is 20 mm in diameter, and including the base pins is 49 mm tall.
Reference: Data-sheet. Type RV12P2000 was first introduced in 1937.