PC for Brsyton 4B SST

Freaky, at the risk of being too opinionated, I'm going to say the $2700
Audiophile APS suggestion borders on ridiculous because you're talking
about a power conditioner with a price that is out of proportion to the
rest of your system, and may or may not be effective. Be CERTAIN you
can audition something like this at home in your own system before you
buy.

You said before the buzz occurs when you connect the receiver, and
goes away when you disconnect the receiver. This suggests the receiver
is the problem.

Will your local stereo shop allow you to do a home audition of another
receiver or preamp? Are you running 2 channel, or is your receiver also
providing multi-channel sound?

Here's another idea. With the system on, take a wire and touch one end
to a metal part of your receiver's chassis (or screw...bare not painted
metal...you get the idea), and touch the other end to the metal chassis
or screw of the Bryston. Does the buzz go away? Don't touch the IEC
outlets...just some exposed metal on the individual chassis. You're
testing to see if this provides a ground for an ungrounded component.
Sometimes Bryston has a ground screw somewhere on the back panel
that you can use for this. Perhaps the NAD does too.

Disclaimer: I am a hobbyist, not a professional. Consult a seasoned
professional for more complete information.

I really dislike lawsuits.

Tvad,

I agree with you about the power conditioner.

My reciever is for now operating for both 2/ch and HT duties.

Yes it is correct when the reciever is not connected to the amp and both are turned on there is only a slight hiss. The hiss does not increase with the volume a good thing right.

With the reciever and amp connected and both turned on the buzz returns. It also returns when my amp is taken out of the loop and the reciever running the whole show.

You mentioned the use of a wire can you give me any suggestions.

I have a better repore with another store a different one but I haven't asked them. Next time I visit them I will.

Tommorow I will call Bryston and find out about a ground screw and I'll try the same with Nad.

Freaky, any wire will do...lamp cord...some old speaker wire...anything insulated where you touch it and with bare ends. The ground screw will be obvious if you look on the back of the receiver or amp. Plus, you don't need a ground screw to do the test...just any bare metal or screw that's part of or attached to the chassis.

I asked about two channel vs. multi-channel because I wanted to know whether the idea of a different preamp or receiver was the right choice. So, you're using the Bryston for amplification of front left and right channels? Did you buy the Bryston from a dealer? If so, perhaps they can loan you a Bryston SP 1.7 multi channel processor to test. Otherwise, a different multi channel receiver. It sure seems to me the NAD is the culprit. Again, the hiss is common.

Unfortunately I bought the amp from a fellow Audiogoner.

Yes the amp is for amplifying the Lt and Rt channels. It might take some doing in obtaining a loaner piece of any kind, but I'll try nonetheless.

What would it mean if I try the wire test and the buzzing goes away or stays the same.

If the buzzing goes away, connect it with a couple pieces of tape. It made the buzz go away, right? So, it means it worked!

If the buzz is still there, then you're back to the beginning. But I seriously doubt any power conditioner is going to make it go away. Try calling NAD and asking them if your model receiver is grounded or not. If it's not grounded and the Bryston is, then that might explain the buzz. It'd also explain why the wire might work, because by connecting the NAD chassis to the Bryston chasssis, you're in effect grounding the NAD to the Bryston. At least this is what I've been told by others wiser than me.