Hi
Guys,
Been trying a second hand Rotel 5 channel THX power amp as an
"upgrade" to my beloved Yamaha DSP-A1 and it does make a more than
minor improvement. I've just watched Lost In Space and the whole thing is
far more dynamic - even at low volumes. Hopefully the neighbours will be
out
tomorrow and I'll be able to give it a try at less "neighbour friendly"
levels!
Have one problem though ... that's my video scaler for my CRT
projector. When it is on I get awfull howling noises coming through the
speakers being driven by the Rotel and so I assume that the PSU on the
QuadScan simply throws huge amounts of mains noise out which the Rotel
can't
reject through its PSU. The power specs for the QuadScan are 12-18v @ 23w
(so about 1.5A then yeah?) terminated in a 2.5mm barrel type power
connector
with the centre positive - does anyone local to me (Winchester) have any
sort of suitable PSU that I could borrow to try powering the QuadScan from
to see if I can get rid of the noise?
The guy who is selling the amplifier has had exactly the same
problem
with the PSU for his QuadScan introducing noise into the audio and so I
know
that it's not just my setup and that it happens with all of the QuadScan
PSUs. (I assume that this is why he's selling it but at the asking price
it's a decent bargain.)
I've tried powering the QuadScan from a long extension lead running
from the garage (to try to introduce a longer cable run between the two as
damping) but that hasn't helped, I've also had them both plugged into
adjacent sockets on the stripblock but with no change. Unplugging the PSU
from the QuadScan and plugging the PSU into the mains gives no noise
(reasonably enough given that there is then no load on the
PSU).
Any other thoughts or suggestions would be
appreciated...
Cheers
Phil
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