The RCA 5734 is described as a mechano-electronic transducer for the measurement of vibration up to 12 kHZ. The top of the body is a thin diaphragm and the central pin can be displaced by up to 0.5 °. Thus the design is a transducer that responds to vibration.
The valve was measured with the protective sleeve in place.
The top of the plate shaft is protected by the copper cover when not in use.
The base with evacuation tube and lead-out wires.
The copper cover protecting the plate shaft at the centre.
The thin metal tube envelope is 7 mm in diameter, and excluding the base wires is 26 mm tall.
Reference: Data-sheet. Type 5734 was first introduced in 1948.