Mods for ARC preamp / amp

I mean an Oppo.. yeah easy to upgrade the audio. A product like the Ref 3 would be pretty tough to mod and have it worth a damn. AND Audio Research would not later be willing to fix it. Unless they put all the stock stuff back. So then you got no more factory support. And One of the GREAT things about Audio Research products is they will fix them nearly forever. (except the CD players.. which was a parts problem) So your modded Ref 3 resale goes out the window.
If you REALLY need to upgrade your Ref 3... BUY a new Ref 5.
I own several Audio Research products.

Do an internet search on GNSC modifications. They are not new at this and have been doing it for a long time. Steve also has a history with ARC. I believe that there are some reviews of their mods on HiFi+ magazine. I have not owned thier products but have heard them in others systems and was impressed.

I have had the following ARC products modded by GNSC over the years with stunning sonic results. Highly recommended.
PH3SE, LS16MKI, REF2MKI, REF Phono, Classic 120's.

I currently have a REF3 LE and a REF2 Phono at GNSC being modded as we speak.

Visit their website.

Have read lots of positive reviews of these guys, and since they have been promoted on Audiogon, they are recommended.

I think Elizabeth summed it up just right. I don't think I would want somebody besides ARC messing around with my $10,000 component. I own the REF 3>REF 110>CD 7 combo.