I have been listening to it ..Powering up and down all last weekend. No problems..Bass seems a bit tighter at high volume levels..But these amps have always sounded excellent..I've been using one almost daily since spring of 1980...Its due for a refurb.Still sounds excellent..:scratch2:
So I won't sweat it putting in the 22,000 uF's then. Too bad most modern large electrolytics now come with tiny pins instead of the robust tabs like on the original caps.
The M-4 is a great amp. I'm surprised it's not more highly regarded given it's awesome performance. That said, it made mine quite affordable. :tresbon: