Help with Output Cap Discrepancy - 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 8th May 2008, 04:53 PM   #1
diyAudio Member
 
Join Date: May 2008
Default Help with Output Cap Discrepancy

Hello All,

I'm in the process of Modding a Music hall cd25.2 and I've come across a little problem with the output film caps. The value on the caps read 1uF, but the board position is marked '104' which i believe translates to 0.1uF. I'm looking to replace these with some nice RelCap's or Dynamicaps and it would be cost effective if I could use the 0.1uF value.

Anyone know why there is this discrepancy? Should I just suck it up and stick with the 1uF?


Also, the unit uses Nichicon's Fine Gold capacitors. I was thinking of swapping these for Nichicon KZ or Blackgate Standards. Are the fine golds good enough? Would this just be wasted effort?

Thanks for the help!
  Reply With Quote
Old 8th May 2008, 06:08 PM   #2
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Default Re: Help with Output Cap Discrepancy

Quote:
Originally posted by Ampersands
Anyone know why there is this discrepancy? Should I just suck it up and stick with the 1uF?
Info on choosing output caps in the first couple of paragraphs at http://www.ecp.cc/cap-notes.html

Quote:
Originally posted by Ampersands
Would this just be wasted effort?
Probably.
  Reply With Quote
Old 8th May 2008, 09:30 PM   #3
diyAudio Member
 
Join Date: May 2008
I've actually seen your capacitor shoot out here and on head-fi. You certainly give great information. One question though, for input impedance, is that 'looking in' from the cd output jacks, or 'looking in' from the amplifier its attached to?
  Reply With Quote
Old 9th May 2008, 12:01 AM   #4
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Quote:
Originally posted by Ampersands
One question though, for input impedance, is that 'looking in' from the cd output jacks, or 'looking in' from the amplifier its attached to?
I'm not sure i follow you. The input impedance is what the cd player sees. So, if you plug your cd player into a preamp with a 50K potentiometer, the input Z is ~50K. There is more to do to get it exactly right such as considering the output Z of the cd player to be in series, and the input Z of the preamp circuit in parallel, but these will change the value only slightly (probably less than the tolerance of the cap), so they can be safely ignored.
  Reply With Quote
Old 9th May 2008, 12:21 AM   #5
KP11520 is offline KP11520  United States
diyAudio Member
 
KP11520's Avatar
 
Join Date: Apr 2007
Hi,

Doug has done us a fine service and Tony Gee has too, so read them both, but also look at the thread by DaveT on "Tripath Input Coupling Caps."

Coupling caps, either input or output, kinda do the same thing so Dave's thread has some value too. Between all three, if you read all of it, you will have some great ideas on how to start, test and achieve the results you desire. You will also gain some additional knowledge that will come in handy somewhere in this hobby! Oh, and you just might find some real values in these threads that will save you some cash!

ALWAYS REMEMBER, YMMV! So you have to test your choices in your circuits. These are just guidelines that may help you shape your test choices!

Good luck!

Regards//Keith
__________________
If Wile E. Coyote had enough money to buy all that ACME ****, why didn't he just buy dinner?
  Reply With Quote
Old 9th May 2008, 02:47 AM   #6
diyAudio Member
 
Join Date: May 2008
Thanks guys. I may have been unclear in my earlier post, but you answered my question. Thanks.
  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
Difference between SE output transformer and push-pull output transformers hilbert_mostert Tubes / Valves 12 8th March 2009 06:10 PM
3C24 in a SE output stage - output transformer impedance recommendation !!! aldovan Tubes / Valves 15 6th September 2008 11:18 AM
Adding secondary of output transformer into cathodes of output stage ? Eico ST-70 freddymac406 Tubes / Valves 3 21st April 2007 07:15 PM
Calling Dr. Fletcher! Dr. Munson! Apparent 20 dB Discrepancy! kelticwizard Multi-Way 10 18th November 2004 02:59 PM
I2S digital output in Marantz CD4000 and four TDA1541A with balance analog output iklari14 Digital Source 30 18th July 2003 01:57 PM


New To Site? Need Help?

All times are GMT. The time now is 12:27 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