[R-390] R390: 60 Hz on Audio

[Steve Hobensack]

I have a small amount of hum on my 63 Imperial. I found it was coming from the PTO signal. As a test, I dismounted the pto canister, and the hum went away. It was mechanical coupling to a vibrating chassis. The vibration was coming from the power transformer. I greatly improved the hum situation by loosely mounting the power supply. 

Steve N8YE


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