Hi all, this is my first post to AK. I've found a great deal of information here this site has become invaluable to me. I've picked up a Marantz 1090 that i'd like to revive. its a good looking amp but after I opened it up i can see it needs some love. The unit power's on. Right channel puts out sound but doesn't seem stable (volume fluctuates). The left channel is completely out: fuse is blown as well as some components. (close up of components below) My question for you is how do we determine when a receiver is too far gone? I can solder and test components. I'm just not sure whether replacement parts are readily available or too costly. I know its hard to tell from a visual inspection. Just looking for some advice based on your past experience before I dive in too deep.