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This reflex klystron was designed for microwave RF generation of about 20 mW about 9.7 GHz. It produces a continuous output and can be modulated for communications use. The output power is taken from the probe by passing the tip into waveguide. The base for this valve is special but an International Octal holder with pin four drilled out is equivalent.

Typical operating voltages are: cathode grounded, resonator at +300 V at 25 mA, and reflector at -100 to -200 V at 5 uA. 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. See 723A/B for a cut-away view of the interior of these small Klystrons.

The thin metal tube envelope is 25 mm in diameter. The probe is 32 mm long. Excluding the IO base pins and probe the valve is 55 mm tall.

References: Data-sheet. Type 723A/B was first introduced in 1944. See also 1944 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.