Magnetron (DMD2 actually)

1-4_Jack_Pinout.jpg
 
The jack only has 3 pins, it's a mono, only did a visual inspection and the, what in the picture says Tip switched, looked like the tip, will try to connect to the tip later when I get home.
To +1 everyone else, I'm pretty sure you have the I/O wires on the wrong lugs of the jacks. You can see all of the variants of these on the datasheet: https://www.taydaelectronics.com/datasheets/files/A-1121.pdf

The different versions add more lugs, but the location of a given lug never changes.
 
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