I have a pair of MA-1 Silver Anniversary edition amps that I had upgraded to Mk 3.1 some time ago. I see they are now up to Mk 3.III. Has anyone made this upgrade? What did you hear different, and how significant was it?
My friend had his MA-1 amp upgraded last year and he was very pleased with the sonic improvement. Sorry, I don't know what changes were employed, but he was also given a new 3-year warranty which is a really nice added bonus.
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