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Noise in an old NAD 3020

I bought an old NAD 3020. It works great except, when I first turn it on I get distortion for about two minutes. After that I only hear the distortion when I turn a knob. Anyone know whats wrong here?
baileyje
subaruguru
1,375 posts
 
Check for bad caps in the power supply?
amsia
5 posts
 
I just picked up a used NAD 3020B which seems to work fine. Unusual is that every time I powered it on, it seems to send a kinda of vrooom.... sound to my speakers for a second. I've sprayed the inside but still the same. Is this common with some units and what is the best DIY repair?
jotam
17 posts
 
Hi:

My recently sold NAD 3020 use to "thump" when turned on and right after that one channel sounded like big sunami waves. Those noises usually disappeared in a couple of minutes.

The solutions were: Push mute button before powering on and let pass two or three minutes to get things warmed-up.

After that it should sound nice.

Good luck
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