McCormack Silver vs. Gold revision for DNA-125?

Not sure about silver v. gold, but I can tell you that my DNA-0.5 Rev A+ was an exceptional amplifier.

I cannot speak to the Silver or Gold revisions, but others speak glowingly of them. I can tell you that I very recently had my DNA-225 upgraded to Platinum status and the results are absolutely mind-blowing. It is one of the finest amps I've ever heard, in or out of my system. Review coming soon.

Not sure about the silver or gold, but I replaced my DNA-2 LAE (limited anniversary edition) amp with DNA-2 Revision A (one step behind the gold).

The DNA-2 Rev. A amp is easily the finest I've heard. I've owned it for almost 2.5 years now and after previously owning about 6 other amps, I still have no desire to upgrade this amp. Unless perhaps it were to a Gold or Platinum version.

-IMO

I don't have any revisions (yet... :-) on my DNA-125, but if you hear much graininess (not sure what 'grunty' means as a complaint), I would ask if you're leaving yours permanently powered-on. Not turning mine off seems to eliminate just about all significant hints of grain by day 2.

BTW, on a tangent, I've recently played around with auditioning my 125 hooked up to only one speaker, to make the comparison with my tube monoblocks more fair in terms of power supply demand vs. capacity. The results hint tantilizingly at what may be expected from an SMC power supply upgrade (only Platinum upgrades the power transformer), not to mention monoblock conversion.