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The VX4032 is an experimental S-Band pulse cavity magnetron operating at a wavelength of about 9 cm. No details have been found in the literature to suggest that this was used as the prototype for a CV specification.
The overall length is 205 mm and the pattern of construction follows that of the CV56 and other cavity magnetrons of the period. The output probe would be inserted into waveguide with the threaded section used for fixing.
Electrically the anode is connected to the case and held at earth potential. The heater/cathode would be at around -15 kV.
Unlike production devices the central copper cylinder is not surrounded by disc fins for forced air cooling. As with all these magnetrons the large magnet was external and the central cylinder would sit between the pole pieces.
The VX4032 can be seen to be made from several sub-assemblies: two copper tubes with glass to metal seals for the cathode connections, another copper tube with the output probe and fixing thread and the central copper block that would be machined to form the central section with the cavities surrounding it. The final parts are the two copper discs that close the central block. The copper parts are soft soldered together.
The output probe with two glass/metal seals.
The fixing thread fixed to the copper tube. The flared section is yet another component. This simple output tube can thus be seen as less than simple.
The heater/cathode connections. The evacuation point is on the top glass segment. The pins exiting from the glass/metal seal are completer with stranded wires welded to the pin tops.
The top disc has been turned from a rod of copper and has the Type designation stamped into the metal. The VX prefix is believed to denote an STC product but it could be a product from Services Electronics Research Laboratory. If STC, the 4 indicates a UK made device. If VX032 it could indicate an ITT device made in USA.
The wide metal tube envelope is 62 mm in diameter and is 33 mm tall.
Reference: Observation.


Updated October 24, 2021.
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