Musical Concepts amplifier modifications upgrades


I would like to hear from people that have had their amplifiers modified by Musical Concepts. I am looking at having two GFA- 555 amplifiers modified / upgraded by them. I only want to hear from people that have had their amps. upgraded by Musical Concepts.
tomcheeser
@tomcheeser...I saw your other thread about Big Sky Audio.  I've never heard of those guys.

If you really are going to have this done, please let John do it.  He's been doing these mods forever and probably knows more about them than anyone, (just my .02 cents worth).

I have a brand new musical design D140 amp its the best  money Iv spent in my 40 plus years in my hifi journey! That’s all I have to say period!