Spectral DMA 200

@jalbertwebsterjr  : Here you can rea part of the Spectral topology design.

I always admired the Spectral designs and had opportunity to listen to it 3-4 times and are excelent and normally the owners don't let it go their units:

Spectral Audio DMA-180 High-Current Reference Amplifier

Btw, maybe you need to test your unit loaded and not " empty ".

R.

When a source is connected another hum is present or takes over > this hum will increase with volume. Head scratcher 

You need to use a Spectral preamp and MIT cables with it.  If not, the amp can be driven into oscillation easily.  Have you checked out Audio Circle, there may be a Spectral group there?

No sir, but thank you for the lead, will check it out!!

Spectral does not work on older gear since they can no longer get the parts.  Goodwins Highend may be able to help if anyone can.