Mr. Yamaha
Not so much Yamaha lately...
Came across this blog about a Yamaha M-2 rebuild at Google results page 9. Might be inspiring and helpful to M-2 owners
He is also doing many other rebuilds, all well documented.
http://marantzhallo-fi.blogspot.nl/2016/12/jims-yamaha-m-2-power-amplifier-ns.html
He is also doing many other rebuilds, all well documented.
http://marantzhallo-fi.blogspot.nl/2016/12/jims-yamaha-m-2-power-amplifier-ns.html