Skeletal vs Plinth style turntables


I am pondering a new plinth design and am considering the virtues of making a skeletal or closed plinth design. The motor unit is direct drive. I know that as a direct drive it inherently has very low vibration as opposed to an idler deck (please do not outcry Garrard and Lenco onwners coz I have one of those too) but simple facts are facts belt drive motors spin at 250rpm, Lencos around 1500 rpm, DD 33 or 45 rpm. That being the case that must surely be a factor in this issue. What are your thoughts. BTW I like closed designs as they prevent the gathering of dust.
parrotbee
Hi ct
I have read the articles by catsquirrel. They are theoretically quite sound, but there is a big BUT - that lenco is the only plinth(less) deck he has made and propagation changes with mass. In other words theory and no practice...
All said and done it's gonna be a mixture of theory and magic...
Hi Parrotbee (PB)

regarding those internet links I believe I found them interesting at the time for the material resonance values. that was it.

that lenco is the only plinth(less) deck -

A plinthless Lenco ? - well even I find that one a little funny. Very different beast than a DD or Belt drive TT.

One way to do up a Lenco

Jean Nantais believes more mass will only improve the sonics of an idler. His designs focus on high solid mass which leave space around the critical turntable parts. So when you see a JN lenco do not think it is solid all the way through, even though the thing still weighs 100 lbs.

"a massive non-resonant structure with voids" in his own words


Armpod void


Motor void

As you can see there are Voids "open space" all the way down and the bottom is open.

Hope you and others find the pics useful ?

PB - All said and done it's gonna be a mixture of theory and magic...

Well I don't have a lot of patience for theory. At least for those that dwell on it with no follow up. I also do not believe in magic.

Cheers
my bad... the first pic link above should read Armboard void. JN defintely does not believe in armpods. Evident from his designs.

A case of Armpod on the brain for me I'm afraid. Wasn't kidding about the cabin fever. ...:^(

Hi CT
Not a believer in magic - not even david copperfield? paul daniels?
I guess a bit of experience may help as well...
LOL
Not a believer in magic - not even david copperfield? paul daniels?

PB
actually that's the kind of magic I assumed you meant. Let me qualify a little.
I know this kind of 'magic" is all tricks deep down.
Oh, oh.....sorry to disappoint anyone reading here that believes in it.
(memories of telling my younger brother that Santa Claus was not real just went through me)
Well, you did not hear it here..... ok ?

I guess this kind of magic just doesn't register as anything memorable and lasting to me.
I can't explain it. Maybe my career line of work has conditioned me in a certain way here.

How about the Audio Foolery that happens in my/our rooms? I enjoy it greatly and can't live without it as an audiophile. but it is not magic.
It can be recreated in other rooms by many others.
But the music itself, which even when heard in your car and causes a reaction ...that is a bit of magic to me as a music lover.

Now think about this one... how about a comedian?
Someone that can go to a foreign country where they speak a different language, have a different culture and values.
And then do a show that discusses the same, and makes them laugh in their own house.
That..... IS a little bit of Magic to me.

Two honorable mentions

4 lb small mouth bass on 2 lb fishing line.

When the wife pulls my keys out of her bosom, and allows me to drive my summer car;
Even though she makes me take her to go buy ice cream.

PB
If you can make this cold weather go away. hmmm....
Make it happen first, then I will let you know.