The CV57 is a beam tetrode designed as a pulse modulator for WWII radar magnetrons. This type of duty places great demands on the cathode and subsequent developments in 1942 replaced these beam tetrodes with the CV85Trigatron for magnetron modulation.
These high values for voltage and current are peak values. The maximum anode dissipation is 15 Watts and the screen dissipates up to 0.5 Watts.
We understand that the CV57 was used in pairs connected in parallel to pulse modulate the AI Mk VIII Radar in late 1941. The magnetron used in this Radar was the CV64.
This exhibit is new and thus never used and in perfect condition. It cam wrapped in soft wadding in an oversized box. The box was thin pasteboard and no maker id was present inside or out.
The ceramic insulators are required due to the high voltages. The beam plate is clearly visible within the anode.
Through the gap in the anode the beam plate and then one of the grids. The control grid is gold plated. Within are two flat surfaced cathodes.
The seam of the anode and above and below the anode both inner grids have heat radiating fins.
The inner grids both have copper supports and the shape of the heat radiating fins is wavy for extra area.
At the op of the image can be seen one screen grid wire and by the anode seam can be glimpsed the gold plated grid wire.
For fitting into a bayonet holder the base pins are solid and firmly attached. The locating pip on the side of the shell ensures the correct orientation.
The classic envelope is 51 mm in diameter, and excluding the special base pins is 178 mm tall.
