The CV67 type of klystron was used in early 10 cm radar systems as a local oscillator.
These klystrons were used to provide a continuous Local Oscillator (LO) signal at the correct frequency for the particular radar so that this remained available to the radar receiver between transmitter pulses when the magnetron was silent. Typical LO power output was only 300 mW at 'S' band (approx. 3 GHz) but this was sufficient to mix with the (very weak) radar echoes in a superhet-type receiver. In early radars the tuning of the magnetron transmitter was not adjustable so the klystron had to be 'tweaked' until the LO frequency matched that of the magnetron.
This exhibit is missing the top cap. The discs are 46 mm in diameter.
Above the base are the heater and cathode leads. The emitting surface is the flat top of the bright cylinder.
A closer view of the cathode and the two discs that clamp to the external resonant cavity.
The shapes of the cavity electrodes. The electron stream passes through the holes in the plates to the collector connected to the top cap.
The hollow lower plate.
The collector mounted in the centre of the top disc but not touching it.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 135 mm long.
References: Data-sheet & Private communication. Type CV67 was first introduced in 1941. See also1941 adverts.
