Ringing Garrard Model 82

[Moonwatcher]

Hello, I have seen a number of forums on deadening ringing aluminum platters, but the use of rubber mats and felt and Plastidip rubber coating has had zero effect on this turntable. I cannot find anything that would be scraping the platter, and I have used a couple of different idler wheels. which both caused this extremely aggravating scraping sound, unless the scraping is coming from somewhere else. It sounds like it’s coming from the idler, but I don’t know. I will spray on a couple more coats of Plastidip tomorrow, but I just don’t get it. It’s a nice turntable otherwise, and in fact after spraying on that rubber stuff, which maybe provided extra mass, I was really kind of blown away by the sound of Keith Jarrett’s piano.

But there must be a way to silence the problem (see below). I’ve seen posts about applying bitumen, but I don’t want to deaden all the life out of the turntable either.

One possible clue is that when the idler is disengaged the ringing/scraping seems to disappear as the platter coasts to a stop.

Any thoughts? Thanks!

 

[TechEd58]

Hello, I have seen a number of forums on deadening ringing aluminum platters, but the use of rubber mats and felt and Plastidip rubber coating has had zero effect on this turntable. I cannot find anything that would be scraping the platter, and I have used a couple of different idler wheels. which both caused this extremely aggravating scraping sound, unless the scraping is coming from somewhere else. It sounds like it’s coming from the idler, but I don’t know. I will spray on a couple more coats of Plastidip tomorrow, but I just don’t get it. It’s a nice turntable otherwise, and in fact after spraying on that rubber stuff, which maybe provided extra mass, I was really kind of blown away by the sound of Keith Jarrett’s piano.

But there must be a way to silence the problem (see below). I’ve seen posts about applying bitumen, but I don’t want to deaden all the life out of the turntable either.

One possible clue is that when the idler is disengaged the ringing/scraping seems to disappear as the platter coasts to a stop.

Any thoughts? Thanks!

I don't think it's coming from the idler. I had the same thing on an SL-95B. Basically something was setting it off once per revolution, but only when it was spinning fast. I think the inner platter wasn't completely flush and something was hitting very slightly (glancing blow to set off the ringing) once per revolution. I don't think this is fixable except by changing the platter. My theory is that certain combos of base (by base I mean here the main metal plate of the TT) and platter are not compatible. It's cause the Garrard tolerances in general are shite to begin with, so mixing and matching parts from different decks has its limits. You haven't done that here so my only guess is that there is somehow some warpage over time.

 

[Moonwatcher]

Wow, you are so right! I found another platter on eBay that seemed have a built-in rubber ring around the outside. And it runs perfectly silently. I don’t understand sound waves enough to get why felt and rubber mats and rubber paints seem to have little to no effect, but I’m glad I was able to salvage this turntable. I also have a Lab 80, but this one has a lifelike quality that I appreciate. Maybe it’s the symbiotic relationship between my components. Thanks.