I'm searching for a good amplifier for my tri-amping project, and found this NAD 916 on an auction site. Seller states that it works fine and is in good condition, but I'm a bit worried about the oxidation (?) that's visible in the attached picture. Is this just a matter of giving it a good clean, or could there be some serious problems inside? I won't be able to inspect it before buying, although I suppose I could ask if the seller would take a picture of the insides.
Any input would be appreciated!
Any input would be appreciated!