Turntable Hum - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th June 2003, 02:54 PM   #1
Delboy is offline Delboy  United Kingdom
diyAudio Member
 
Join Date: May 2003
Location: London
Question Turntable Hum

I have noticed recently that my cartridge is picking up hum the closer it gets to the spindle, i.e. it seems ot be coming from the motor which is an a.c. type located to the rear left of the tt. Does anyone have any ideas about how to cure this problem?
  Reply With Quote
Old 4th June 2003, 06:58 PM   #2
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Hi, Delboy

What brand is it?
Does the hum increase when you move the arm in the up-position towards the spindle, or only when playing music?
Is the hum gone when you stop the motor?

/Hugo
  Reply With Quote
Old 4th June 2003, 09:02 PM   #3
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
I think that you must check the ground wire to the motor... There must be a bad connection there.......
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 5th June 2003, 06:59 AM   #4
Delboy is offline Delboy  United Kingdom
diyAudio Member
 
Join Date: May 2003
Location: London
Quote:
Originally posted by Netlist
Hi, Delboy

What brand is it?
Does the hum increase when you move the arm in the up-position towards the spindle, or only when playing music?
Is the hum gone when you stop the motor?

/Hugo

Hi Netlist,

The cartidge is the Music Maker and it only hums when the motor is spinning whether it is in the up or down position, as long as it is close to the spindle.
  Reply With Quote
Old 5th June 2003, 07:01 AM   #5
Delboy is offline Delboy  United Kingdom
diyAudio Member
 
Join Date: May 2003
Location: London
Quote:
Originally posted by ACD
I think that you must check the ground wire to the motor... There must be a bad connection there.......

Hi ACD,

There are 3 wires to the ac motor, I can't see which is the ground. How can I find out which wire it is?
  Reply With Quote
Old 6th June 2003, 06:55 AM   #6
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
Quote:
There are 3 wires to the ac motor, I can't see which is the ground.
It's hard to tell, as there are no standard colours for this.
Try to see where they are comming from..
Otherwise take a simple wire and attach it to the ground pin of one of the signal phono plugs.
Then (with the motor running) shortly touch the other end of the wire to the metal housing of your arm (near the pick-up). If the hum disappear, your ground wire to the arm is bad.
If this is not the case, then shortly touch the free end of the wire to a metal part on your motor.

One of the above should solve the problem
Keep us informed about the results
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 6th June 2003, 07:29 AM   #7
diyAudio Member
 
Join Date: Jun 2002
Location: Italy
Quote:
Originally posted by ACD
One of the above should solve the problem

I encountred the same problem with an AC motor ,but a ground connection to metal parts of the motor didn't solve it .

It is a matter of cartridge . Not every cartridge rejects the noise from motor at the same way. Sometime , if the noise is very high is better use a low-voltage-electronically-controlled motor.

Generally high voltage AC motors are more intrusive , but I did not find the problem using MC phono cartridges.
  Reply With Quote
Old 10th June 2003, 10:02 PM   #8
Delboy is offline Delboy  United Kingdom
diyAudio Member
 
Join Date: May 2003
Location: London
Quote:
Originally posted by ACD


It's hard to tell, as there are no standard colours for this.
Try to see where they are comming from..
Otherwise take a simple wire and attach it to the ground pin of one of the signal phono plugs.
Then (with the motor running) shortly touch the other end of the wire to the metal housing of your arm (near the pick-up). If the hum disappear, your ground wire to the arm is bad.
If this is not the case, then shortly touch the free end of the wire to a metal part on your motor.

One of the above should solve the problem
Keep us informed about the results

I have already tried these things to no avail, the hum is still present, but thanks for your input.

Quote:
Originally posted by stefanobilliani



I encountred the same problem with an AC motor ,but a ground connection to metal parts of the motor didn't solve it .

It is a matter of cartridge . Not every cartridge rejects the noise from motor at the same way. Sometime , if the noise is very high is better use a low-voltage-electronically-controlled motor.

Generally high voltage AC motors are more intrusive , but I did not find the problem using MC phono cartridges.

I think that this is most likely as you say an ac motor problem. I am looking into trying a dc motor with my tt to see if this cures the hum. Thanks for your contribution
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for a turntable bgatlin Swap Meet 1 15th December 2005 08:52 PM
New turntable rocknroll Analogue Source 5 9th January 2004 05:52 PM


New To Site? Need Help?

All times are GMT. The time now is 02:08 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2