Mccormack DNA-225 platinum


Over the weekend I purchased a Mccormack DNA 225 platinum for $400 at an estate sale along with a set of Vandersteen 5 speakers. I knew that Mccormack amps had a good reputation and only realized that it was a platinum when later when I set it up. I can't find much info on the platinum upgrades. Does anyone here know what was upgraded and what it means? Also what would a 225 with the platinum upgrade sell for? sorry for my basic questions. 
128x128mzwerner
@mitch2 Thanks - I’ve got everything up and running and the V5 - Mccormack combo sounds amazing.

The picture is indeed my amp - good eye - per the guys at Mccormack the transformer is a Plitron and they also mentioned Jensen.

The 225 is signed on the back by Steve and says Platinum he upgraded it in 2013.

Also do amplifier stands make any real difference? 

I appreciate everyone’s help.

@mz, 
Well, anything that mitigates vibration and other outside influences will certainly help with making more coherent sound reproduction.
Stillpoints, solid maple shelving, or Ayre blocks are known to help with this.
An inexpensive place to try some of this is Herbie's Audio Lab.  
Bob
Great advice from @gdnrbob!  Herbie's products are effective, well made and reasonably priced.