Hum from Turntable

+A -A
Autor
Beitrag
myriad
Ist häufiger hier
#1 erstellt: 12. Okt 2007, 03:19
Hello Guys,
I have a problem.
My tt has started humming recently.
There is a hum:- only when the needle is on the groove and platter rotating.
There is no hum:- when the needle is on the groove and platter stationery.
There is no hum:- when i take off the belt which disengages the motor from the platter and i spin the platter with my fingers.
All this leads me to think that it's the motor which is causing hum.
What do you guys think and what are the remedies to fix this problem?
Thanks
ani
Stammgast
#2 erstellt: 12. Okt 2007, 04:48
Hi,
Can you hear the hum when the turntable is running ie the motor is driving the platter with the arm cued up near the center of the disk ?

If so the cartridge is picking up the stray magnetic field of the motor. From your equip list you must be using Project RPM4 TT and Sumiko Pearl, try using other cartridge with better Magnetic shielding.

Regards
Anil
myriad
Ist häufiger hier
#3 erstellt: 12. Okt 2007, 14:27

ani schrieb:
Hi,
Can you hear the hum when the turntable is running ie the motor is driving the platter with the arm cued up near the center of the disk ?

If so the cartridge is picking up the stray magnetic field of the motor. From your equip list you must be using Project RPM4 TT and Sumiko Pearl, try using other cartridge with better Magnetic shielding.

Regards
Anil


There is hum only when the arm is in the groove and motor running i.e. the record playing. The hum goes away as soon as motor stops.
ani
Stammgast
#4 erstellt: 12. Okt 2007, 15:27
Is there hum when you cue up the arm with the motor running ?
myriad
Ist häufiger hier
#5 erstellt: 12. Okt 2007, 15:53

ani schrieb:
Is there hum when you cue up the arm with the motor running ?


No

I just disengaged the belt and switched on the motor. I felt lot of vibration coming from the motor. Surprisingly, i did not feel any vibration when i took the motor off from it's rubber suspension when directly placed on the plinth. I put the motor back on suspension, pulling the suspension rubber and tightened the screws. This way the motor got little more elevation than previous thus reducing any chances of touching the plinth. Now there is very minute hum which is tolerable.
ani
Stammgast
#6 erstellt: 13. Okt 2007, 05:02
So it was mechanical noise picked up due to improper motor suspension. Why don't you change the rubber ring used as motor suspension, it might have lost its elasticity due to aging. Similar sized neoprene rubber O-Ring available at shops that sell oil seals and allied rubber products.
myriad
Ist häufiger hier
#7 erstellt: 13. Okt 2007, 11:39

ani schrieb:
So it was mechanical noise picked up due to improper motor suspension. Why don't you change the rubber ring used as motor suspension, it might have lost its elasticity due to aging. Similar sized neoprene rubber O-Ring available at shops that sell oil seals and allied rubber products.



Yes I will do so.

Thanks very much Ani
Suche:
Das könnte Dich auch interessieren:
Turntable hum
abhijitnath am 11.08.2008  –  Letzte Antwort am 13.08.2008  –  4 Beiträge
Buying on the Net
purnendu am 29.04.2005  –  Letzte Antwort am 25.08.2005  –  11 Beiträge
Is "the vinyl revival" a scam?
Shahrukh am 10.08.2010  –  Letzte Antwort am 11.08.2010  –  18 Beiträge
Bad turntable
Mudbug am 05.02.2006  –  Letzte Antwort am 06.02.2006  –  2 Beiträge
My SH-GE90 is broken!! :-(
nfung am 01.04.2005  –  Letzte Antwort am 01.04.2005  –  2 Beiträge
Why is this external noise from my Turntable when put on at high volume?
philipmorris am 18.07.2006  –  Letzte Antwort am 20.07.2006  –  19 Beiträge
What is the difference between Pre Amp & Amplifier?
philipmorris am 19.07.2006  –  Letzte Antwort am 19.07.2006  –  6 Beiträge
which amp to buy ???
johnny69 am 12.11.2003  –  Letzte Antwort am 17.11.2003  –  8 Beiträge
The French hifi scene
square_wave am 01.06.2011  –  Letzte Antwort am 16.06.2011  –  14 Beiträge
Taking the plunge : sonodyne speakers - please advise!
trivisingh am 26.02.2005  –  Letzte Antwort am 01.03.2005  –  13 Beiträge
Foren Archiv
2007

Anzeige

Aktuelle Aktion

Partner Widget schließen

  • beyerdynamic Logo
  • DALI Logo
  • SAMSUNG Logo
  • TCL Logo

Forumsstatistik Widget schließen

  • Registrierte Mitglieder918.198 ( Heute: 28 )
  • Neuestes Mitgliedmantasel
  • Gesamtzahl an Themen1.535.107
  • Gesamtzahl an Beiträgen21.209.106