The CV89 is a split anode magnetron for generating around 200 mW at 4.762 GHz. The CV79 is the other version of this magnetron and operates at a lower frequency. They were used in Wireless Set 10 MK.I transmitters for eight channel telephone systems. These provided line of sight communications and were employed in the D Day landings in 1944.
The CV79 and CV89 were both based on M-OV experimental valves.
The cylindrical oxide coated cathode tube has a coiled heater within. The anode side plates have been punched to leave six fingers each that protrude at right angles to cover the cathode.
A side view of the diode structure. The magnetic field causes the electrons to spiral.
The coiled heater.
The form of one anode plate can be seen here.
The vertical anode plates are retained at the top my a mica sheet.
A clear view of the inter-digital split anode.
The B9G base. Most of the valves used in the No. 10 Set were B9G based including the ARP35 in the receiver.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9G base pins, is 74 mm tall.