Nakamichi ca-7 hum problem - diyAudio
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Old 11th November 2014, 09:46 PM   #1
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Join Date: Nov 2014
Default Nakamichi ca-7 hum problem

Hello everyone,

My Nak preamp has a hum that doesn't goes up with volume control. Frequency seems to be at 60Hz, plus to this I can hear something like "radio talking" also doesn't go with volume. Hum is present with no devices connected to inputs.

Sound anyway clean, no distortion.

I've checked power supply, everything seem to be OK +/- 0.2V from Service manual values.

Looks like ground problem, can't find it.

Out of ideas.

Thanks in advance!

M
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