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Sensibly equivalent to:
2K25 723A/B CV1795 KS9-20D
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This CV2792 is new and came in a moulded polythene box as shown below. The inside of the box is shaped to retain the klystron and prevent damage to the delicate probe.
The base is a modified IO. The valveholder was specially designed with a hole to accept the probe in the place pin 4 would normally go. The valveholder would be mounted on waveguide 16 and the probe inserted in the wide face. In this way the output RF energy was coupled to the rest of the system.
This Klystron was designed for microwave RF generation of about 20 mW at 9-10 GHz. It produces a continuous output and can be modulated for communications use. but was originally developed as a local oscillator in Radar receivers.
The mechanical adjustment acts on a pair of steel strips that are moved apart by the screw action. This movement is passed to the top of the valve where corrugations in the envelope allow a small change in the internal cavity size.
The Klystron frequency will change rapidly for small changes of voltage or temperature. Thus these devices are required to operate from stabilised supplies and be isolated from temperature fluctuations.
To obtain frequency modulation is simple, a small modulating voltage is superimposed on the DC of the reflector.
Typical operating voltages are: cathode grounded, resonator at +300 V at 25 mA, and reflector at -100 to -200 V at 5 μA. The klystron produces RF with the mechanical tuning and reflector voltage at quite critical points. Several RF producing conditions existing for a particular valve. The strongest being the one chosen.
Here is another CV2792 and it is mounted in a professional waveguide 16 mount.
The brass waveguide and flange have been silver plated. The round flange accepts quick assembly two part screw-together connectors. The screened cable connects to the repeller at the top.
The probe can be seen in the waveguide. It is offset for a better match and thus power transfer.
The mounting is 40 mm in diameter and the waveguide is 105 mm long. Waveguide 16 has outside dimensions of one inch by half an inch. (25 x 12.5 mm).
The coarse tuning is carried out by means of the screw bellows.
The modified IO base and top cap.
The five leads have been cut back to the base.
The thin metal tube envelope is 25 mm in diameter. The probe is 30 mm long and metal cased for 23 mm. Excluding the modified IO base pins and probe the valve is 56 mm tall.
References: Datasheet & RSGB publications.


Pin Connections


Absolute Maximum Operating Conditions
Microwave Valves
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2013.
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