My D200 Mk2 is dead silent through the speakers, but has a mechanical hum/buzz (exactly how I describe it) when connected to a PS Audio Power Plant Premier. To be clear, the noise emanates from the amp chassis.
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I have a D200 mkIII and no noise with my speakers that are sensitives : 95db/w/m (Tannoy GRF).
But you should check the gain setting of your amp. On GamuT amps you can set the gain between around 20db and 35 db. The default setting is high : aver 30db, if I remember.
You can test with a lower gain, like me : I use the lowest gain in my system.
In order to modify the gain, you have to remove the top plate of the amp and select with some little switches (two by side, located on the top of the power circuitboards).
It is pretty normal for any high-powered unbalanced (RCA input)amplifier to hum if nothing is connected to its inputs.
To be certain, short one end of a pair of RCA cables with paper clips, telephone wire, a piece of solder, whatever is handy and conductive, insert the other end of the IC on the amp's input connectors and turn the amp on.
By short I mean connect the center plug to the outer collar of the RCA plug. Better still, buy a pair of inexpensive RCA plugs from RS and sloder pluas and minus together.
This will NOT damage any RCA input amp or preamp.
I bet the hum will disappear.
BTW I used to own a MKII, great amp.