Spectral DMA 200

@jalbertwebsterjr , my best friend was talked into a Spectral System way back and it included the DMA 200. It is an extremely unreliable amp if used with anything but Spectral gear. After blowing the amp twice he sold it and now is happy as a lark with McIntosh  gear. Spectral is also a PITA to deal with. They could care less about their older equipment.

Thanks to all for the input, as this forum has contributed very helpful information. I  can’t stop admiring the beauty of this handmade piece and don’t know how to curtail this obsession of wanting to hear it sing in its full glory. I’d feel ashamed to let this opportunity go to the wayside. Provided none of the groups advice pan out, I’m hopeful the universe will find a way for the DMA 200 to bring another individual JOY!

thanks again for all the intel and all the best

@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?