On 3 Jan 2007 23:15:00 -0800, "max graff" wrote:

Hi Don,

I hear the low-frequency 'dhub' when I lift/lower the stylus when the
amp is connected.

OK - that one is easy. You need to sort out your technique for
raising/lowering the stylus. You have too much sideways movement at
the moment, which is forcing the stylus over. That causes the low
frequency signal in the sub.

Some time I can also hear it when I have left the amp on and powered
off the NAD phono amp.


That was as Jim suspected - you are hearing bias conditions flying
around during voltage changes.

I thought it was an Amp problem and switched connection to my old Denon
PMA 250 (2-channel) and the problem still exists. I guess this is the
dilemma of using analog equipments.

As Jim suggested I have decided to either lower the volume down to 0 or
change the source before changing the vinyl sides or while
starting/stopping the equipment.

Thanks to all for helping me out.

Cheers

MB

No problem - the volume control is the tool of choice here.

d

--
Pearce Consulting
http://www.pearce.uk.com