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July 16, 2014 - 7:30pm
#1
Pro-ject Debut Carbon makes sine wave noise when playing records
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A few questions for you.
Is this a new table that has exhibited this problem from the beginning, or have you been using it for a while and this just developed over a period of time?
Has anything been done to the table recently?
Cart replace?
Alignment adjusted?
Is there any reason to think something may be loose?
Feet, the rack or table the TT is on, etc?
Do you use a mat (cork, felt, nothing) between the platter & vinyl album?
Do you use a weight placed on the spindle?
Thanks.
Bill - on the Hill
Practicing Curmudgeon & Audio Snob
- just an “ON” switch, Please –
I appreciate your taking the time to respond to my post.
It is a new table which has been set up for five days. The first two days were problem free. The "tone" manifested itself on the third day.
Nothing has been done to the table (or to the rack or any other part of the sound system) since the initial setup.
The table, feet and rack are not loose.
I use the felt mat supplied by Pro-ject between the platter and vinyl album.
I do not use a spindle weight.
Thanks, again.
Kerry
It covers a lot of different possibilities.
http://www.padrick.net/Hi-Fi/PhonoHum.htm
It seems as if the noise is 240 Hz, which is a harmonic of 60 hz. it is almost certainly caused by some sort of grounding problem.
Make sure the turntable, amplifier chassis, and phono preamp are all tied together with ground wires. Use a chassis cover screw for a wire attachment point.
It might also help to connect those grounds to a wire from a clamp on a metal water pipe.