New Solid Aluminium Platter for the SL1200

[Mike_New]

Hi Folks,
Rather than high jack the present thread in which I have posted some details of the new platter, I thought that it would be more appropriate to start another one which caters for those specific people who are interested in the new platter.

I have included an image of what is now the agreed production design. The black band around the periphery is the anti-resonance Neoprene ring. You can see the two holes for lifting bolts now included. These have been threaded 8mm and I would suggest that all is need is to fit two 8mm x 35mm socket head bolts. The holes are threaded 12mm deep for adequate lifting security. The top surface of the platter is 300mm in diameter.
The platter shown weighs 11.5lbs and sits 1mm higher than the standard one, although this will vary from deck to deck. This unit is destined for a Canadian customer.

The design assumes that the customer will need to swap out his magnet assembly into the new platter. This is very straight forward as an 8 pole pulse generator ring has been fitted to the platter and pre-aligned for correct rotation direction and phasing.

The new platter assumes the use of an external power supply as the existing transformer and power board will fowl it. Also you will require to increase the braking power by adjusting the pot. On my test rig the platter stops in ¾ of a turn from 45rpm, not bad eh!!

[DSJR]

Love the SL110/1100-esque profile..

Mike, can you not investigate the possibility of an SP10 style deck plate, to which the entire drive system can be transferred. A shame that Technics won't suply the motor unit as an OEM item.

[Mike_New]

DSJR,
I am currently in the process of designing a totally new plinth for the SL1200.
Into which all the bits will be transplanted. This will provide an upgrade path from the new bearing and platter to a completely new deck!! also Dave has sugested that I provide for 12" arms The exisitng drive board will just slot into place.

[Marco]

Hi Mike,

Excellent stuff, and good idea to start a new thread

The design assumes that the customer will need to swap out his magnet assembly into the new platter. This is very straight forward as an 8 pole pulse generator ring has been fitted to the platter and pre-aligned for correct rotation direction and phasing.

Also you will require to increase the braking power by adjusting the pot.

As I thought all that needed doing was to swap one platter for the other (presuming the use of a quality external PSU), you'll need to explain exactly how to do the above, as I've never ventured near the internals of my deck and don't have a scooby-doo what to do.

What is the "magnet assembly" and what does it look like?

Could you possibly post some pictures with arrows pointing at the bits you're taking about and where this pot is that controls the braking speed, and how you access it all?

Remember you're talking to a complete 'dunce' as far as this sort of stuff is concerned so please make it entirely obvious and easy to understand!

I think it would also be good to supply some instructions of how to do this along with every platter supplied, if you haven't done so already

Marco.

[Gdg]

Hi Mike,

Excellent stuff, and good idea to start a new thread



As I thought all that needed doing was to swap one platter for the other (presuming the use of a quality external PSU), you'll need to explain exactly how to do the above, as I've never ventured near the internals of my deck and don't have a scooby-doo what to do.

What is the "magnet assembly" and what does it look like?

Could you possibly post some pictures with arrows pointing at the bits you're taking about and where this pot is that controls the braking speed, and how you access it all?

Remember you're talking to a complete 'dunce' as far as this sort of stuff is concerned so please make it entirely obvious and easy to understand!

I think it would also be good to supply some instructions of how to do this along with every platter supplied, if you haven't done so already

Marco.

Very easy Marco, three screws under the platter, inside the magnet.
You can see here (1st pic)
http://theartofsound.net/forum/showp...4&postcount=48

[The Vinyl Adventure]

yeah even i can do that without messing it up marco, its very easy

[Mike_New]

Marco,
I would have liked to offer the complete platter assembly however the magnets are unobtainable. They are 16 radial pole isotropic magnets and are very expensive to manufacture in any quantity under 5,000.

Full instructions will be provided with every unit.
The braking control pot is well known about by most SL1200 gurus. and is described in the technical manual.

I have had to machine and supply the position pulse generator as this controls the motor rotation (incorrect positioning will make the platter rotate in reverse!!) A red dot on the inside of the magnet cavity serves to corectly position the magnet.

[Marco]

Hamish/Giovanni,

Mmm... Seems easy enough, but I think I'd rather watch someone else doing it first, so I can see it for myself. Sorry, that's just the way I am!



Marco.

[The Vinyl Adventure]

Blimey marco grow some balls
it's a lot more fun owning a techie if you know the thing inside out (even if that has meant you have broken it a couple of times

[Marco]

Hi Mike,

Marco,
I would have liked to offer the complete platter assembly however the magnets are unobtainable. They are 16 radial pole isotropic magnets and are very expensive to manufacture in any quantity under 5,000.

Full instructions will be provided with every unit.
The braking control pot is well known about by most SL1200 gurus. and is described in the technical manual.

I have had to machine and supply the position pulse generator as this controls the motor rotation (incorrect positioning will make the platter rotate in reverse!!) A red dot on the inside of the magnet cavity serves to corectly position the magnet.

Thanks for that, Mike - much appreciated

Marco.