Pink Triangle LPT noise

snap, crackle and pop
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Bryanwalsh67
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Pink Triangle LPT noise

Post by Bryanwalsh67 » 11 Feb 2019 22:04

Hi, Just come into possession of a lovely LPT. Delighted with it, but, when it's warmed there's sometimes a slight rhythmic whirring noise from the platter as if something is catching intermittently. If I apply even the most gentle push of the suspended plinth backwards the whirring becomes constant and louder. The sound actually is heard through the speakers as transmits through the platter (vibration?) I was advised that this might be to do with the rubber mounting of the platter on LPTs causing the belt to rub and to apply a gentle pushing force on the platter from the top left to the bottom right position. Any experience and informed views welcomed. Thank you...

ChrisfromRI
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Re: Pink Triangle LPT noise

Post by ChrisfromRI » 12 Feb 2019 02:17

Can you pull the bottom plate off and set the turntable up on two or three supports (even something as simple as paint cans) so you can get to the underside to readjust the suspension? Level it, and then make some suspension adjustments to see how you can optimize the suspension to get it to run properly. It sounds like your suspension has settled too low in at least one corner.

I use a plastic milk-crate that I cut the top out of, and it works great for supporting most Thorens and also my Linn LP12, while allowing full access from underneath to adjust their suspensions for just the right bounce.

abril
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Re: Pink Triangle LPT noise

Post by abril » 12 Feb 2019 09:54

Can you pull the bottom plate off
There is no bottom plate on the LPT.
Best you go to the Pink Triangle forum for knowledgeable answers.

Is the pulley catching on the underside of the platter?
The motor mount may be set a fraction too high.
10257
Gives you an idea of how it is mounted

Bryanwalsh67
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Re: Pink Triangle LPT noise

Post by Bryanwalsh67 » 12 Feb 2019 10:14

Thank you - did you post an image of the mount? I can't seem to access it? Also can you point me in the direction of the PT forum? At the moment I've inserted a small piece of folded card between the sub and outer plinth at the top left corner and that is applying the tiniest amount of forward movement to remove the noise. It sounds like the motor pulley is catching on the sub plinth...
abril wrote:
12 Feb 2019 09:54
Can you pull the bottom plate off
There is no bottom plate on the LPT.
Best you go to the Pink Triangle forum for knowledgeable answers.

Is the pulley catching on the underside of the platter?
The motor mount may be set a fraction too high.
10257
Gives you an idea of how it is mounted

Bryanwalsh67
junior member
junior member
Great Britain
Posts: 9
Joined: 03 Feb 2019 00:28

Re: Pink Triangle LPT noise

Post by Bryanwalsh67 » 12 Feb 2019 10:17

Sorry - I can see the image now I've replied...
Wow - looks like there's plenty of margin for error and need for adjustment / tweaking there. Time to take it back to my specialist (who used to work for PT)

Thank you again..

abril
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Re: Pink Triangle LPT noise

Post by abril » 12 Feb 2019 10:19

viewforum.php?f=45

If that is all it is it's not difficult to rectify.
There is no sub plinth or sub platter,it is rather like a Linn Axis in construction except for the acrylic platter.

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