Marantz CD63 & CD67 mods list - Page 1913

UV101 · 21st March 2013, 10:40 PM

And it'll be even better if you regulate the new rails

This was using +/-8v from the original transformer, but you can use +/-12v regs if you are using a separate transformer and power supply.

dwjames · 12:07 AM

Quote:

Originally Posted by UV101

This was using +/-8v from the original transformer, but you can use +/-12v regs if you are using a separate transformer and power supply.

I've seen mention of +/-8v, +/-9v & +/-12v regs used for these. Are the servo driver ICs not bothered about the voltage as long as it's stable?

6h5c · 22nd March 2013, 08:10 AM

No, they can handle upto +/-20V supply voltage, so that's not a problem. But I don't think you'll gain anything from a higher supply, the motor needs only about 4V. The 7812/7912 regulators are more common though, not all suppliers carry the 8V or 9V version.

Ray

dwjames · 22nd March 2013, 08:27 AM

Thanks Ray, I've got some 9v regs on the way.

UV101 · 22nd March 2013, 06:12 PM

Is it a KI version? The reason I used 8v is because with the std transformer, there wasn't enough drop out for 9v regs

dwjames · 22nd March 2013, 06:36 PM

No, it's a standard normal low spec one.
If my 12v rails are almost completely unused as I have a valve output stage, would it be worth using that to feed these 6 x 9v regs instead?
Or is that no comparison to a separate 50va toroidal tx?

Ben Hanke · 23rd March 2013, 03:38 AM

It'll be no comparison. Go big or go home

UV101 · 23rd March 2013, 08:23 AM

Quote:

Originally Posted by Ben Hanke

It'll be no comparison. Go big or go home

Lol

dwjames · 24th March 2013, 08:27 AM

Cheers guys. I'll just get some 8v regs for now if they work better with the standard transformer

Also, I'm trying to work out which ceramics and resistors need removing if I'm putting some good quality electrolytics for the local decoupling caps like rubycon ZLG 220uF to the servo driver ICs. Has anyone got info or a diagram for that?

dwjames · 24th March 2013, 05:01 PM

Actually, I've had a good study of the schematics and I've got it all now, other than the 2 ceramics c146 and c148 being a bit too close together to swap for the ZLG caps and c144 being kind of in the way, but I guess it's nothing a bit leg bending and maybe swapping c144 to the bottom of the board won't sort out. Is that the usual method?

21st March 2013, 10:40 PM	#19121
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	And it'll be even better if you regulate the new rails This was using +/-8v from the original transformer, but you can use +/-12v regs if you are using a separate transformer and power supply. __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

22nd March 2013, 08:10 AM	#19123
6h5c One Seriously Addicted to Audio and Electronics diyAudio Member Join Date: Apr 2004 Location: Heerhugowaard	No, they can handle upto +/-20V supply voltage, so that's not a problem. But I don't think you'll gain anything from a higher supply, the motor needs only about 4V. The 7812/7912 regulators are more common though, not all suppliers carry the 8V or 9V version. Ray __________________ Gonna buy my little girl a pink soldering-iron The new DOS-CFP board is out!

22nd March 2013, 06:12 PM	#19125
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	Is it a KI version? The reason I used 8v is because with the std transformer, there wasn't enough drop out for 9v regs __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

23rd March 2013, 03:38 AM	#19127
Ben Hanke diyAudio Member Join Date: Dec 2007 Location: Vancouver, BC	It'll be no comparison. Go big or go home __________________ Modified Marantz CD63KI -> Modified PM66KI -> B&W 805S

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22nd March 2013, 08:27 AM	#19124
dwjames diyAudio Member Join Date: Jun 2012	Thanks Ray, I've got some 9v regs on the way.

22nd March 2013, 06:36 PM	#19126
dwjames diyAudio Member Join Date: Jun 2012	No, it's a standard normal low spec one. If my 12v rails are almost completely unused as I have a valve output stage, would it be worth using that to feed these 6 x 9v regs instead? Or is that no comparison to a separate 50va toroidal tx?

24th March 2013, 08:27 AM	#19129
dwjames diyAudio Member Join Date: Jun 2012	Cheers guys. I'll just get some 8v regs for now if they work better with the standard transformer Also, I'm trying to work out which ceramics and resistors need removing if I'm putting some good quality electrolytics for the local decoupling caps like rubycon ZLG 220uF to the servo driver ICs. Has anyone got info or a diagram for that?

24th March 2013, 05:01 PM	#19130
dwjames diyAudio Member Join Date: Jun 2012	Actually, I've had a good study of the schematics and I've got it all now, other than the 2 ceramics c146 and c148 being a bit too close together to swap for the ZLG caps and c144 being kind of in the way, but I guess it's nothing a bit leg bending and maybe swapping c144 to the bottom of the board won't sort out. Is that the usual method?

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