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Old 1st January 2012, 05:42 PM   #17781
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Happy new year everyone! Those fleas look good Ben, nice work, looking forward to hear your results soundwise. It's nice to follow this fine thread, thanks to all contributors.
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Old 1st January 2012, 09:31 PM   #17782
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Cheers to that. This thread is my favourite place on the web ever.
Thanks for the tip, Ian. I thought PK would be a fair swap for the ZLG but I'll consider swapping them for something more suitable.
I had fun building that PSU, and the big snap-in Mundorf caps are 40% off atm, and I was thinking: I have all these separate +5v 317 supplies powering my chips - should I build separate PSUs for those? (I've got the bug quite badly now)
If so, should I regulate them separately to, say, 8v, and how much VA is enough per individual supply? Thanks guys.
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Old 1st January 2012, 09:42 PM   #17783
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...or should I start the DOS next? ;-)
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Old 2nd January 2012, 04:12 AM   #17784
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Ah, looking back, Ray said 7VA was enough for the DAC and Lee suggested 50VA for the drivers would be a more valuable next step than the DOS.
Mmm.. I have 3 quite compact quad 5v reg modules for the chip supplies (12 regs total, of which I'm currently using 10). I'm thinking I might get 3x 9v 7VA transformers and 22,000uF AG caps to feed them. I should have room down the right side for all that.
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Old 2nd January 2012, 07:04 AM   #17785
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Hi Ben,

I think that whichever step you take, it will be an improvement! But if you haven't upgraded anything around to opamp section yet (like the filter components), i'd go for the DOS, it will make a big difference.

Ray
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Old 2nd January 2012, 08:40 AM   #17786
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I've done some work there. My op-amp section is recapped with BG FK/N/NX and 1% silver micas, but resistors are original and buried under big caps due to bad planning. If 7VA is big enough for each chip then maybe I'll get the ball rolling on that while I wait for the XOs.
DOS parts will take some research, I think...
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Last edited by Ben Hanke; 2nd January 2012 at 08:42 AM.
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Old 2nd January 2012, 10:39 AM   #17787
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Ben,

If you've done the op-amps and filter caps around them then I would suggest beefing up the servo supplies next. The DOS will only make a nice medium difference, the servo a LARGE difference.

Simon
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Old 2nd January 2012, 04:43 PM   #17788
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Ah, OK... I'll take a look at the 'Doing it Properly' stage of Brent's upgrade guide for the servo section.
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Old 2nd January 2012, 11:53 PM   #17789
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Happy new yr to all,
been busy with work .All sorted a nice work space for modding, counter, scope lets ,see whats available.
alan
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Old 4th January 2012, 05:10 AM   #17790
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Quote:
Originally Posted by SimontY View Post
Ben,

If you've done the op-amps and filter caps around them then I would suggest beefing up the servo supplies next. The DOS will only make a nice medium difference, the servo a LARGE difference.

Simon
Hi Guys, is the servo power supply mod is exactly the same as for the 67 and 63 cdp?. I am fitting extra torroid for the op-amp(67cdp) and thinking of doing the servo as well. Would it be a good idea for them to share the power supply ? or best leave the stock tranny to power servo as concern re noise interference?
Quan
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