A Question For The Lads...

["Phillip Harris" <phillip.harris1@xxxxxxx>]

 

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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