The Astron hum indicates it is pulling more amps as it would when the line
voltage drops because of the heavy load of the hair dryer upon the circuits.
Perhaps the hair dryer is on the same fuse or circuit breaker as the radio/
Astron circuit.
Loose laminations on transformers are also a cause of hum. Tightening the
mounting bolts usually takes care of that. In extreme cases, adding mass to
the metal cover may detune any audio resonances.
Stuart
K5KVH
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