AtmaSphere Upgrade from Mk 3.1 to Mk 3.3

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?

honest101-18-2020 2:22pm

Showing 3 responses by gdnrbob

gdnrbob Details Discussions Posts This discussion Message User 4,485 posts 01-18-2020 at 09:49pm Copy Comment URL Report Comment Edit Delete I only have experience with the 3.3's, but when I was looking at buying a non 3.3 Ralph and Adam have told me, it is a very big upgrade- sound and rebuild-wise(hence, the cost. If I recall, it also affect tube performance. Hopefully, others will chime in. I just want to give a quick response. Bob
gdnrbob Details Discussions Posts This discussion Message User 4,485 posts 03-15-2021 at 09:16pm Copy Comment URL Report Comment Edit Delete @honest1 , I am glad you posted your experience. I am also glad that you found it a significant upgrade. BTW, did you get the Caddock Resistor upgrade? Bob
gdnrbob Details Discussions Posts This discussion Message User 4,485 posts 03-16-2021 at 08:50pm Copy Comment URL Report Comment Edit Delete Thanks for that info. I really wish I had done it while it was in the shop. Oh well, something to add to my upgrade list... Bob

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