I had a stack of consumer audio gear in my bedroom in 1979, but terrible
radio reception.
I figured it out:
1) AM radio reception was getting interference from the snap off of the
rectifying diodes in the power supply in the power amplifier. Snubbers
fixed that.
2) The FM reception was getting interference from the electric blanket
regulator. I got a wool blanket.





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Be careful what you pray for, it can happen.