Upgrading a Yamaha M-70 power amp?
Has anyone upgraded or modernised their Yamaha (class A) M-70 power amp?
If so, what did you do that produced audible or measurable benefits?
I've done several upgrades and mod to this unit.
Links to similar discussions:
Recently toasted my M-45 (cousin to the M-70) while adjusting
the bias (top mounted jumpers carry voltage rails). I am in the
final stages of installing a new amp module in the shell of the old
The darn protection circuit. . .very picky. The M-70 is technically more
advanced than the M-45 though.
M-70 protection problem
There are lots of comments about M-70 protection problems. My amp has this problem - will not switch on. It was a gradual thing as it took longer and longer to start up.
Does anyone know how to fix this - whats the usual problem?
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