Rubber grommit on CDP crystal

ash_dac · 30th May 2005, 05:15 PM

Hi,

Does this upgrade work ?

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

Kind regards,

Ashley.

tubenut · 30th May 2005, 06:10 PM

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.

jean-paul · 30th May 2005, 06:37 PM

Or do it the right way straight away and replace the crystal for a quality clock

ash_dac · 30th May 2005, 08:09 PM

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.

tubenut · 31st May 2005, 07:38 PM

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...

tubenut · 31st May 2005, 07:42 PM

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.

30th May 2005, 05:15 PM	#1
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	Rubber grommit on CDP crystal Hi, Does this upgrade work ? http://www.diyaudio.com/forums/showt...633#post638633 Kind regards, Ashley.

30th May 2005, 06:37 PM	#3
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Or do it the right way straight away and replace the crystal for a quality clock __________________ It's only audio

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30th May 2005, 06:10 PM	#2
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	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.

30th May 2005, 08:09 PM	#4
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	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.

31st May 2005, 07:38 PM	#5
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	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...

31st May 2005, 07:42 PM	#6
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	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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