Here we go again…i’m being offered a Marantz 300dc power amp. It lights up but has no sound. Has anyone experienced this with this particular model or any other Marantz models? The 300dc seems to be selling for $2500-3000 based on hifi shark. Seller is asking me to make an offer, but I have no clue if this issue is even fixable. How much should I offer if ever? You guys think this could be fixed fairly easily by a competent tech?