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Old 28th March 2009, 09:41 AM   #3221
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hi ERIK

due to my poor skills (impatience) I pulled out the stable platter mechanism disc from an old machine and simply used it as the basis for the puck. So instead of the ebony with the jvc central fixing puck i showed in a previous photo, i simply exchanged it for the aluminium disc. The contact between the rubber/aluminium and the cd disc is of course of poor close contact due to having to sink into it the original puck. However, for whatever mechanical reasons, e.g air vibration effects between disc and cd through the 'umbrella effect' it works best for me out of all the pucks i have tried.

So basically all i am saying is why not try a very thin plate of aluminium with a bit of rubber glued to its surface as an alternative material for a puck

Have fun.

You know what, i am fed up of removing the transport mech out of the boom box. I am gonna gut the boom box (speakers, tape mech radio etc) stiffen its walls and build a power supply inside. I then have the original cd mech and all its buttons in place, and to be honest will look better than my shoddy cosmetic attempts. I will have the power supply plug and in fact the transformer and its rectifiers already in place. I'm also keen to see what effect having the lid shut has, after all i am finding that pucks that cover the entire surface of the disc even without touching the cd's surface tend to sound best. Finally the cd mech will continue to sit on its spongy supports which feels very effective as a vibration absorber.


Luke
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Old 28th March 2009, 12:59 PM   #3222
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Thanks Luke for the explanation...

Fran send me an ebony puck...and guess what...

What ebony does for an analog turntable it does for a digital turntable as well....

I decided not to try to understand what puck-resonances do..... but my first and very noticable impression that it changes my music for the better...After a while I can place a review for the interested.

Fran you made my day !!!!!
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Old 28th March 2009, 01:00 PM   #3223
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His Masters Voice indeed...
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Old 28th March 2009, 06:23 PM   #3224
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i'm gonna retry the ebony but this time as small as the ones you are using, perhaps my first attempt may have been too large and hence the midrange prominence.
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Old 28th March 2009, 06:45 PM   #3225
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by m.massimo


ok jitter, it makes sense.
I forgot to mention that frequency tolerance of the stock ceramic resonator ZTTMX is usually 0.5%=5.000ppm.
In the last two days I listened to many other well-known CDs and all sounds better by far with the Citizen installed.
I know that in the past many declared there was no change or that the stock was better (i.e. johnm http://www.diyaudio.com/forums/showt...05#post1488505), but in my system there's no doubt at all.

I thought the Citizen crystal was a quantum leap forward, and it was one of the very first changes I made to my interpretation of the Shigaclone. I thought they sounded kind of mediocre and indistinct with the stock resonator, sort of bland in a pleasant, but not involving kind of way. (This was true for both of my mechanisms) All of the changes I made were quite audible with my homebrew/TPA based DAC which has recently improved significantly with a change to PCM1794A chips from the PCM1798s I was previously using.
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Old 28th March 2009, 06:49 PM   #3226
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by audiojoy
hi ERIK

due to my poor skills (impatience) I pulled out the stable platter mechanism disc from an old machine and simply used it as the basis for the puck. So instead of the ebony with the jvc central fixing puck i showed in a previous photo, i simply exchanged it for the aluminium disc. The contact between the rubber/aluminium and the cd disc is of course of poor close contact due to having to sink into it the original puck. However, for whatever mechanical reasons, e.g air vibration effects between disc and cd through the 'umbrella effect' it works best for me out of all the pucks i have tried.

So basically all i am saying is why not try a very thin plate of aluminium with a bit of rubber glued to its surface as an alternative material for a puck

Have fun.

You know what, i am fed up of removing the transport mech out of the boom box. I am gonna gut the boom box (speakers, tape mech radio etc) stiffen its walls and build a power supply inside. I then have the original cd mech and all its buttons in place, and to be honest will look better than my shoddy cosmetic attempts. I will have the power supply plug and in fact the transformer and its rectifiers already in place. I'm also keen to see what effect having the lid shut has, after all i am finding that pucks that cover the entire surface of the disc even without touching the cd's surface tend to sound best. Finally the cd mech will continue to sit on its spongy supports which feels very effective as a vibration absorber.


Luke
Shoddy workmanship aside half of the magic in this thing is in tightly coupling the mechanism chassis to some mass. I should think you might find just building a simple open chassis arrangement might be preferable sonically to sticking to that boombox - who cares what it actually looks like if it works ok. Perhaps you could enlist the help of someone local to make a nice box for it.
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Old 28th March 2009, 07:12 PM   #3227
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I am also a bit confused (pun not intended) Audiojoy...

You work with bybees and ebony while on the otherhand you want to put it in a plastic (be it reinforced by you) encasing....which will garantee you the loss of a lot of magic...

Be resourcefull and go find an existing case...loads of them on e-bay or new ones in shops.....pick whatever you like...wood or metal...but plasic is a no no......

This is a project that can evolve..... Take more time.........
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Old 28th March 2009, 09:29 PM   #3228
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Ah yes but it looks neat and smart and i have the buttons and a read out and it can be picked up with a handle. Still sounds great.

ok ok will give it a go in something massy, not yet convinced that that will be as important as the rest of the tweaks I have done.

How much of the mechanism is actually touching plastic???it sits almost entirely in free air and is decoupled from a tiny portion of the boom box's plastic via the rubber suspension. If there had been a drawer mechanism with the platter sitting in it then i would have agreed that there was far too much plastic in contact with the mechanism, but this is not the case with this transport mech.

I have lots of ebony about and could do a crude seat mechanism inside the boom box to sit the mechanism on.

Will feedback the findings shortly
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Old 29th March 2009, 12:46 AM   #3229
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Erik,


glad you enjoyed the puck. Apart from the sonics, wood and ebony in particular is a joy to use and hold.

I just hope it stays stable now....


If I get time I will do a post showing how I made the spindle insert and puck.

Most interested to hear anybody else's experience with puck/holddown materials/methods.

Kevinkr, Peter, Johnm et al, what do you guys use?



Fran
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Old 29th March 2009, 12:51 AM   #3230
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ok several hours later.......

built a crude box out of ebony (without the top), the ebony wood is about 1cm thick and surprisingly very heavy. Embedded the transport into this with screws holding it firmly directly onto the ebony. I then attached the ebony box onto the boom box interior, separating the ebony box from the plastic via springs. So from the outside it appears as though the boom box has been kept intact.

Yes agreed major improvement in sound far more presence and naturalness of tone, sharp highs have gone as well. Very impressed indeed, I wonder if its the ebony rather than the mass???

However i still get to keep the boom box fully intact in all its glory, except for its guts. The power supply is built from scratch as there was plenty of room inside for a large transformer, loads of uf, MUR diodes a simple regulator and if possible i might try an inductor later on as there is so much room in it.


Thanks for the tip.
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