Rubber grommit on CDP crystal - diyAudio
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Old 30th May 2005, 05:15 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Default Rubber grommit on CDP crystal

Hi,

Does this upgrade work ?

http://www.diyaudio.com/forums/showt...633#post638633


Kind regards,


Ashley.
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Old 30th May 2005, 06:10 PM   #2
tubenut is offline tubenut  South Africa
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Arcam believe it does... So much so that they did this on the original Alpha CDP and called it the Alpha+
Use anything gooey, grommet, rubber band doubled up, blu tack etc etc.
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Old 30th May 2005, 06:37 PM   #3
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Or do it the right way straight away and replace the crystal for a quality clock
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Old 30th May 2005, 08:09 PM   #4
ash_dac is offline ash_dac  United Kingdom
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What happens to the sound with the blue tac / rubber grommet ?

Did you ground the case?


I will get a clock eventually (i have to figure out how to fit another PSU into the CDP)

I understand from the forum that a low noise PSU is essential for a new clock!


Kind regards,


Ashley.
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Old 31st May 2005, 07:38 PM   #5
tubenut is offline tubenut  South Africa
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Less ragged more focussed sound....

I have grounded the case before on other crystals but did several other things at the same time too. Wrapped the crystal in lead tape (available from golf shops) then wrapped in amalgamating rubber tape and lay it flat on the pcb in a lump of blu tack with short thin (slightly looped) wires going to the PCB. The idea being to mechanically isolate the crystal from the PCB but also increase its innertia making it harder to mechanically resonate in the firtst place. It works well but I did all of this at the same time so can not say what made what difference...

Be careful grounding the can though, the heat from the solder job will probably affect the exact freq of the crystal. If you do want to do it grind at the can a little with a file or you will struggle to get the solder to bond to the can and you will need more detrimental heat...
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Old 31st May 2005, 07:42 PM   #6
tubenut is offline tubenut  South Africa
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Change the caps on the crystal legs to silver mica types, very worthwhile upgrade.

Ultimately on most players a better clock is still better though. My Theta CDP uses a better then normal clock cct already so optimising mechanical aspects and electrical (caps) was worthwhile. It also has a dedicated transformer feeding the clock psu as standard.
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