Mike New platter, Oyaide MJ-12 mat & STB-MS stabiliser arrive at Marco Towers...

Agreed Marco ;) Once the natural resonance modes of an alloy platter such as the Techie one have been taken under control i'd agree with you :)

The thing is though is to damp out the standard platters resonant modes & two metals that are vastly different in stiffness appear to do this nicely. The soft copper prevents or should i say seriously reduces the ringing of the standard Techie platter (because it's so soft & has a decent mass) so you hear the music better with less of the TT being evident.

Like i say, some kind or weird sandwich - but one that does what is needed :eyebrows:

Centre hole 7mm, total distance across is 286mm.

The copper mat will need to be 100% flat.


Regards D S D L

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The thing is though is to damp out the standard platters resonant modes & two metals that are vastly different in stiffness appear to do this nicely. The soft copper prevents or should i say seriously reduces the ringing of the standard Techie platter (because it's so soft & has a decent mass) so you hear the music better with less of the TT being evident.

Like i say, some kind or weird sandwich - but one that does what is needed

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Yup, Mark, that's precisely why I had Mike anneal the copper plate/mat onto my version of his platter :)

The same 'sandwiching' principles also apply in the design of turntable plinths, which I suspect will be the final modification to the Techie, and something I believe Mike has been working on ;)

Marco.

It won't be hard to place it under a dead weight to flatten it out. I will see what thicknesses are available tomorrow.

Marco - did I miss something or did you try the Achromat on top of your bonded platter? What was the result?

No, mate, you didn't miss anything, as I haven't mentioned it.

Unfortunately the Achromat wasn't a good match with the bonded copper mat on the MN platter, mainly because the Achromat is rigid and somewhat slippery, and so skids around the place like a DJ slip mat, with the resulting sonic consequences!

Obviously though, you're not finding this a problem with the standard MN platter :)

Marco.

I can't help thinking what would be the effect if you put a flexi disc on the Oyaide mat ,
the holes underneath the record might make certain areas under the thin disc act like a drum skin,
I would assume the effect becomes less as the record gets thicker.

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Originally Posted by Reid Malenfant

I'm just wondering how a bonded sheet of lead (Pb) would work in this situation. It'd be softer than annealed copper & damping wise it'd be far better. Or maybe just a lead mat might be pretty good, just don't go trying to eat it :lol:

Maybe i'm a bit crazy so forgive me, but it's something i'd be willing to try on my deck. It's not a Techie though ;)

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The thought had occured to me, but there are not any church's in my area!!!

Mike

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Originally Posted by markf

I can't help thinking what would be the effect if you put a flexi disc on the Oyaide mat ,
the holes underneath the record might make certain areas under the thin disc act like a drum skin,
I would assume the effect becomes less as the record gets thicker.

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You are essentially on the right track in your thinking Mark.
Attempting to use a thin copper sheet is going to be an exercise in trivia, to the extent that if you are going to use a copper mat then you should be prepared to do so in a sensible way and use the excellent copper mats that are now available and which measure 3 or more mm in thickness. They do the job properly as they were designed to do.
The Standard Techi platter is somewaht dished, and a thin copper foil is just going to flutter like a diaphram if it is put ander the Oyeida.
Secondly this thin sheet cannot be anealed easily, so what are we gaining here??

I was literally thinking of a flexi disc record, actually playing one directly on top of the Oyaide mat