So my amp has been starting to sound like it needs a little TLC recently because it has gone from 'BEST AMP EVER' to 'really good amp' lately (y'know... we all get excited when stuff sounds good). This means it's time to take it to the doctors, but before calling and making it's appointment I'd thought I'd open her up and see what was inside. To my surprise, I found that one of the Marshall 6550s in there has been swapped out for a weird old Leslie 6550 and I can only assume it was done by someo