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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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Thread Tools |
3rd Dec 2021, 11:00 am | #1 |
Pentode
Join Date: Oct 2021
Location: Newbury, Berkshire, UK.
Posts: 132
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Garrard RC88 Motor Hum.
I’m getting a noticeable motor or bearing hum as soon as the needle hits the in run to the tracks does anyone know any good tricks to reduce this. I’m guessing after 60 years the rubber disc on the garrard rc88 has hardened up a bit. Any good damper mat suggestions??
Sounds like a quiet mains motor hum. |
3rd Dec 2021, 6:15 pm | #2 | |
Hexode
Join Date: Dec 2020
Location: Raunds, Northamptonshire, UK.
Posts: 351
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Re: Garrard RC88 Motor Hum.
Quote:
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4th Dec 2021, 10:27 am | #3 |
Pentode
Join Date: Oct 2021
Location: Newbury, Berkshire, UK.
Posts: 132
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Re: Garrard RC88 Motor Hum.
Ok I will check those out too.
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4th Dec 2021, 11:01 am | #4 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,327
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Re: Garrard RC88 Motor Hum.
Can we assume that until the pick up meets the record's grooves, there is no intrusive noise emanating directly from the motor?
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Edward. |
5th Dec 2021, 4:24 pm | #5 |
Pentode
Join Date: Oct 2021
Location: Newbury, Berkshire, UK.
Posts: 132
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Re: Garrard RC88 Motor Hum.
Yes this is the rewound original mono variluctance unit with stereo compatible needle only the needle is touching (the picture has reflection on it so it’s not that clear.
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5th Dec 2021, 4:38 pm | #6 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,327
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Re: Garrard RC88 Motor Hum.
That just does not look right. The tonearm looks too heavy and I can't see the stylus cantilever at all.
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Edward. |
5th Dec 2021, 4:42 pm | #7 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: Garrard RC88 Motor Hum.
I'm probably talking rubbish here but does the RC88 have a mute switch during changing?
If it does the hum may not be apparent before the switch opens as the stylus meets the record. My thoughts are hum picked up between the motor and and the pick-up coil. Due to the very low output of the variluctance pick up is it possible there is a wiring phase fault with the hum bucking coil, that is if it has one. Just ideas into the pot. John. |
5th Dec 2021, 6:34 pm | #8 |
Pentode
Join Date: Oct 2021
Location: Newbury, Berkshire, UK.
Posts: 132
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Re: Garrard RC88 Motor Hum.
Thanks for all the input I’ve got a bit more info while I wait for the gold stripe paint to dry on the radio tuner glass… the hum stops the second you lift the needle and starts again the moment it’s on the vinyl/shelac and the pickup is variluctance so the needle isn’t cantelever as the iron bit has to stay between the coil cores pic of needle below. It does sound the same frequency as the motor. Like it’s being physically transferred through the deck.
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