Marantz CD63 & CD67 mods list - Page 1818 - diyAudio
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Old 18th May 2012, 05:51 PM   #18171
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I removed the 50VA supply last night in preparation to build a standalone servo supply, reinstalling the original transformer The buzz is still there, so it must be something else. I just can't listen to it now - the bass weight has vanished and the top end is grating. I'm not sure if it's best to perservere with the servo PSU plan or just put the big torid back in! Will 50VA supply direct to driver ICs bring the bass back?!?
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Old 18th May 2012, 09:43 PM   #18172
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A while ago I had also a humming torid (the original one) and that was because of a loose soldering contact on the PCB (the 10V supply, the most demanding). Maybe somewhere on the supply lines there's a bad contact? Try to move the wire a bit, to see if it disappears. I think your 9V servo chip supply must work on the standard toroid as well as the 50VA dedicated one without the buzzing.
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Old 19th May 2012, 01:24 AM   #18173
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I wimped out and crammed the servo PSU back in. The sound is back again. I left the KI tx connected for the display. I think I'm still out of my depth with the driver ICs. I'm going to look at driving my DAC and decoder 5v supplies off the unused KI tx output windings instead.

TIL: Clock mods without a big servo PSU makes my ears bleed.
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Old 19th May 2012, 11:34 AM   #18174
Thomo is offline Thomo  United Kingdom
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Ben, where have you conneted the 50va tx? I thought you'd basically replaced the original tx with the 50va one for the main supply (+/-10v ish)

If that's what you've done then the driver ic's are running off that, which is what you want.

Lee.
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Old 21st May 2012, 02:29 AM   #18175
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Yep, that's what I've done. I was thinking of building a separate supply for them, but I've just raised the driver regs to 12v instead. Next step will probably be to replace my 9x LM317 boards with super regs.
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Old 23rd May 2012, 05:35 AM   #18176
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It's funny - since fitting the 12v regs, my sled motor goes mental when I switch on from cold, but it's fine subsequent times.

Lots of parts arrived for my DOS today. I got my FETs in matched pairs and some badass 1% silver micas
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Old 23rd May 2012, 06:56 AM   #18177
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I am toying with the idea of regulating the driver ic s, Worth it or not.

cheers alan
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Old 23rd May 2012, 08:16 AM   #18178
SimontY is offline SimontY  United Kingdom
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You've not even done that Alan? That's the best mod there is on a CD63!
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Old 23rd May 2012, 08:52 PM   #18179
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Default re regs

Quote:
Originally Posted by SimontY View Post
You've not even done that Alan? That's the best mod there is on a CD63!
I know they run raw voltage but unsure to use 9v + and minus or 8v , I know i must use low drop out on pos rails am i correct. 6 in total 1pos 1 neg each ic.

thanks simon alan
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Last edited by bikeral10; 23rd May 2012 at 08:56 PM. Reason: mistake
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Old 23rd May 2012, 09:16 PM   #18180
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I think you're safest to go with +/- 8v on the standard PSU, but if you haven't already then I'd add a 2x12VAC 50VA servo PSU and go straight to 12v regs, or you'll only end up replacing them later like me.
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