DAC repair/troubleshooting in New England

I purchased a DAC in Taiwan quite a few years ago. It’s a dual TDA1541A, with a tube output stage. Really nice construction and components. Pictures are linked below. 
It’s always had a significant hum. I love this DAC and would really like to get rid of the hum, but not savvy enough troubleshoot myself. 
Anyone know a good place within reasonable driving distance from Central CT that would be capable of this?




Showing 2 responses by jabar102

It does not have a USB input, just optical, coax and balanced. 
The hum does sound like a 60hz ground loop, or at least I think it does. 
Hum is definitely there with no inputs connected. I usually use the optical.