Schematic Request: Adcom GCD-575 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd October 2008, 09:27 PM   #1
Pars is offline Pars  United States
diyAudio Member
 
Pars's Avatar
 
Join Date: Jan 2004
Location: Chicago
Default Schematic Request: Adcom GCD-575

Looking for a schematic for this CDP. Going to do some mods to my brother's and schematics would be beneficial if available.

Thanks!
  Reply With Quote
Old 15th October 2008, 11:55 PM   #2
diyAudio Member
 
Join Date: Nov 2005
I am looking for some as well. I can give you three modifications that make it sound MUCH better that are super easy.

Replace the two main capacitors next to the diodes (that feed it I think) and the two other large power supply ones with some panasonic FC's. I went with a bit more uf on the two feeding the dioes.

Here is the big one. Now I am not sure what value to use on the fixed outs, but the two little blue capacitors just behind the variable out, replace them with some Silver Mica .1uf's. They are tiny and fit just nice. The difference in sound will blow you away.
  Reply With Quote
Old 17th October 2008, 06:14 PM   #3
Pars is offline Pars  United States
diyAudio Member
 
Pars's Avatar
 
Join Date: Jan 2004
Location: Chicago
Thanks. I didn't intend on using the output stage, but I'll take a look at the PSU caps while I'm messing with it. Just out of curiosity, where do you find silver mica capacitors that big? All that I normally see are picofarad range....
  Reply With Quote
Old 19th October 2008, 11:27 PM   #4
diyAudio Member
 
Join Date: Nov 2005
Ops they are just 0.1uF panasonic polypropylene caps but let me tell you, they sound so amazingling transparent, they are probably just as good if not better.

Also replace the stock power cord, it is a joke, and throw at least one .1uf Panasonic film X2 cap across the main inputs for it.

Replacing any capacitors in the main power area with FC Panasonics would be a good idea. I might try by passing them with .1uf Panasonic polypropylene caps too.

I have not reviewed the digital area too much, maybe I will have some suggestions. Just in general the power coming it was a bit weak, and the stock capacitors are not that great either. I also put some rope caulk on the DAC chip. The diodes that are used seem to be some three legged creature.... I wanted to put in some MUR860s but no go.

I really want a schematic, the stuff is hard to follow, the tracings. I am sure there are excessive RC networks, resistors, and bad capacitors in the signal paths. Plus it runs on SPDIF, the digital I am sure needs some help. When I apply bypass caps to the main power caps tonight I will take a look at the digital if I can decipher anything about it.
  Reply With Quote
Old 23rd October 2008, 12:20 AM   #5
diyAudio Member
 
Join Date: Nov 2005
A friend said 1uf might be better, and I might try that. They are touchy though...

I am going to through some bypass .1uf on the psu caps I think, and start replacing more, well when all the stuff with paypal and things get worked out so I have not negative money again.
  Reply With Quote
Old 10th November 2008, 01:51 AM   #6
diyAudio Member
 
Join Date: Nov 2005
After looking over the digital I found that replacing the capacitors that feed the clock to be helpful. I think anything near the value will do, some Oscon or BG N's should be good over the crap that is in there.

The digital out has Elna's but you could put some Oscon's in for even better improvement, but in general I was impressed to find those.

There really is not a whole lot to do for the digital. I also put some dampening on the clock.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Schematic request - Crate TD-70 Guitar Amp Sonusthree Instruments and Amps 28 22nd September 2013 09:15 PM
Request for Adcom GFA-555 MkII schematics trluser Solid State 7 31st December 2010 05:12 AM
Studiomaster Diamond 8-2 schematic request blacktone Analogue Source 2 7th September 2010 01:20 PM
Adcom GTP 500 Preamp Request for Help bcrescen Solid State 7 26th December 2008 12:56 PM
Denon DCD-425 Schematic Request blacktone Digital Source 1 15th April 2007 11:22 PM


New To Site? Need Help?

All times are GMT. The time now is 11:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2