I have an opportunity to trade some gear for a '78 Marshall JMP 2204, stock original in good shape functionally... no known mods. It does the tone I want (for now), so I'm not looking to compare it with other amps in that department. Can someone offer pros / cons / known issues with this platform? Are xformers durable? Is the PCB historically faulty? Is this a desirable amp? I've seen prices from $600 to $1400 for the very same year/model/stated condition... not sure what to make of its value. Prefer opinions of those with hands on experience. I've done the search on internet reviews for this amp. I value the opinions and advice from TGP'ers more so than other online reviews. Cheers!