DIY plinth for Rega RP3

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#21
I had a P-3....I just wanted to see what the Regas were all about.

Not impressed, tried different carts......meh.

Was in the middle of building a massive 2 part slate plinth for
my SP-15 and had slate and Padauk wood (from the trim) left over.

The slate is in an "L" shape....two 1" layers with bitumen thin sheet between..the pin striping hides the joint. The armboard lays across the slate "L" and is also sitting on sheet bitumen and stuck with silicone.
The base for the motor is also 2 slate and Padauk, separate from the plinth.

In my opinion its a big step up for the P-3......but opinions are like....you know.

You can judge it all you like.....it far from my best effort.....😉





 
#24
PDR -- That's wonderful! It addresses the 2 big issues of the Rega, a plinth that's much too light for the job and motor decoupling. I love it!

It also looks quite nice, I might add... 😀 😀 😀

Of course, there's no comparison to a SP-15 in slate, but I bet you find your L table at least listenable compared to stock.
 
#25
Bibio said:
i think that you might be trying to use the silicone trough idea that a few manufacturers have use on arms. the way the silicone trough works is to dampen the micro movement of the arm that is imparted from the shaking of the cart by the cantilever so the cantilever can get on with what is supposed to do and transfer the energy into the coils instead of into the cart/arm. having the main bearing housing sitting in a bath of oil is going to do nothing, ok so it might act as a 'sink' but i doubt it. you could always try and see though as i could be wrong. the bearing and arm need to be coupled as rigidly as possible to each other and for that matter the motor as well. problem is as you say the mechanical noise from each interacts with the arm which is having a hard enough job trying to control the resonant frequency's from the cart. this is why 'plinth' material choice is vital. the absolute last thing you want to do is have a plinth material that amplify each individual arm/cart/bearing/motor resonant frequency.

i could be wrong but the whole idea behind the Xerxes and the LPT cutout was to let the unwanted frequency's hit the edge of the cutout then march along the edge away into the main plinth/suspension.
Click to expand...

The idea for the bearing sink into an oil bath came when I saw it from my SME 20.
Ideally, if the bearing could be mounted on the bottom plate and the arm on the top would be ultimate in principle but in practice it is only solving a problem by creating a new one just lake the bay on the original plinth on the Xerxes.
 
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