{Collins} Kws-1 hum

Hi All, had the same problem , the dynamic microphone was acting as a flux detector and picking up the magnetic field of the power supply.
This is why Art encased the high power supply assemblies in iron.
Changed to D104 crystal and problem reduced but not totally removed.

the mike plug was incorrectly wired, but the system limped along to near satisfactory results which in turn directed your problem solving focus elsewhere.
Cheerio from Steve VK4VN

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