I have a very high pitched sound that appears AFTER I play a record or two. When I first turn on the system and select the phono input, it is quiet. When I lift the tonearm at the end of the record, it sounds like a dentist's drill. I can modulate the sound a little by touching the tonearm wire.
I am using a Dynavector 10x5 cartridge, and a Cambridge 640P phono section. All interconnects are shielded.
The noise is the same with the CD player on or off.
Any suggestions appreciated...
Good one, Mr Rubik. :-k
No tubes, right? Phono preamp and TT sharing safety ground, at least same circuit? Try disconnecting your phono ground wire, or moving it to another location, or tightening it. Experiment.
A cart will change sound after half hour of "warming up," maybe that has something to do with this.
That's all I got man, sorry.
Rich,
I do have a tube preamp, and hybrid amplifier. But the only source affected is the TT.
I must hang my head in shame, though, about the ground. I will hook one up and see if it solves the problem. Although, I've heard grounding issues before, and they never sounded like this.
I used to have problems with buzzy hum with my old Bellari tube phono preamp, it actually sounded better without the ground wire connected! It was a common problem for many owners of that pre. Long gone now, thank goodness.
The ground wire wasn't it, though it got rid of a hum heard only at full volume.
Proximity to other equipment wasn't it either...
I switched out the Cambridge 640P with a Rotel RQ-970, and the problem went away.
So, whatever interaction they had just wasn't good, or the Cambridge is defective.
Also, the turntable on/off switch does not THUMP through the speakers when using the Rotel.
Thanks for the response...
Hey, glad you figured it out James. :thumb:
Go to this thread on Steve Hoffman forums to read about a similar problem. The last post is probably the most relevant:
http://www.stevehoffman.tv/forums/showthread.php?t=188406&highlight=10x5+640p (http://www.stevehoffman.tv/forums/showthread.php?t=188406&highlight=10x5+640p)
Mike
Mike,
If I could say it like they do on the Guiness commercial: "Brilliant!'
I had a nagging feeling it was something about my setup, but it
appears to be a known problem.
Thanks!
No problem, James. The only reason I saw that thread was that I was looking for a new phono stage for my 10x5. I ended up with one from a small company called Vista Audio. It is their Phono-1 and it turned out to be a *very* nice phono stage.