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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
tomic601's avatar
tomic601
12,862 posts
 
we sent many Hafler customers to him to wring out better performance, none were ever disappointed 
tomcheeser OP
10 posts
 
Every one seems to be sastified with his work.
minkwelder
255 posts
 
Rather than upgrading the existing design of the amplifier, Mr. Hillig specializes in a redesign of the amplifier. He chooses certain amplifiers as the "bones" on which he builds his own design.
He generally uses the transformer and portions of the power supply, pots and switches while most of the existing circuitry is replaced with his own circuit boards.
I have a couple pieces which he has redone; a Hafler DH-101 preamp and a DH-500 power amp which are significantly better sounding than the originals. I am also currently using a Musical Design D-140 which is his own brand.

I highly recommend his work.   
tomcheeser OP
10 posts
 

The  mods that he advertises on his web sight for Adcom GFA 555 are LX,  LX elite, LX mini- Platinum Upgrade, & under "amp options" filter capacitor replacements. Are you telling me that Mr. Hillig offers different options besides these?

minkwelder
255 posts
 
It appears that new driver boards are limited to the Hafler Power amps at this time, but I think they were once available for the Adcom power amps also.

He does do upgrades using his MC-3 circuit board on certain Adcom preamps as well as outboard power supplies, though.

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