Lower value Cap - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, 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 9th March 2013, 09:58 PM   #1
tony Ma is offline tony Ma  United States
diyAudio Member
 
Join Date: Feb 2011
Default Lower value Cap

Dear All,

Sorry for a newbee questions

I like to know what you guys think with this "upgrade" scenario

Let's just say originally the Tube Pre-AMP has a 1UF capacitor

Can we substitute with some thing close to the original value such as .82UF ?

Is there any sound different?

I knew that the voltage must be the same

Let me know your insight guys

tks
  Reply With Quote
Old 9th March 2013, 10:14 PM   #2
diyAudio Member
 
Robert Kesh's Avatar
 
Join Date: Oct 2012
Quote:
Originally Posted by tony Ma View Post
Dear All,

Sorry for a newbee questions

I like to know what you guys think with this "upgrade" scenario

Let's just say originally the Tube Pre-AMP has a 1UF capacitor

Can we substitute with some thing close to the original value such as .82UF ?

Is there any sound different?

I knew that the voltage must be the same

Let me know your insight guys

tks
Probably be fine. Caps are often +/-20% or more their nominal value, so it's just possible your lower value cap is actually higher value. Circuit may have been designed for a lower cap and rounded up to nearest standard value of 1uF. Hard to tell without schematic. And why the upgrade?
  Reply With Quote
Old 9th March 2013, 10:24 PM   #3
tony Ma is offline tony Ma  United States
diyAudio Member
 
Join Date: Feb 2011
Well there is a leak on the capacitor that is the main reason upgrade / change
  Reply With Quote
Old 9th March 2013, 10:34 PM   #4
diyAudio Member
 
Robert Kesh's Avatar
 
Join Date: Oct 2012
Quote:
Originally Posted by tony Ma View Post
Well there is a leak on the capacitor that is the main reason upgrade / change
Well, like I say, cap type and schematic is really necessary to be sure.
  Reply With Quote
Old 9th March 2013, 10:44 PM   #5
tony Ma is offline tony Ma  United States
diyAudio Member
 
Join Date: Feb 2011
Quote:
Originally Posted by Robert Kesh View Post
Well, like I say, cap type and schematic is really necessary to be sure.
Hmmm I don't have the schematic

It is just in Pre-amp and the original is WIMA MK (film capacitor right?)
  Reply With Quote
Old 10th March 2013, 02:04 PM   #6
diyAudio Member
 
Robert Kesh's Avatar
 
Join Date: Oct 2012
Quote:
Originally Posted by tony Ma View Post
Hmmm I don't have the schematic

It is just in Pre-amp and the original is WIMA MK (film capacitor right?)
What kind of preamp? If it's just a coupling cap, then some leeway may have been designed in. So a -3dB at 5 Hz becomes a -3dB at 6.1dB and nothing is lost. But if it's, say, a phono preamp, and the cap is part of the equalisation, then the tone will change, although probably not by much.
  Reply With Quote
Old 10th March 2013, 02:07 PM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Wima MK don't leak significantly, at least with the equipment that you probably have at hand.
__________________
regards Andrew T.
  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
IC PHC series cap - good low ESR cap? CarlyBoy Parts 2 15th March 2013 02:09 AM
wima or metalized film cap for .1uf input cap? rhythmsandy Chip Amps 9 24th August 2012 03:37 AM
cap for adding offset before adc - but which cap in signal path?? thesoundlab Parts 3 31st March 2011 04:50 AM
Polar electro with bypass cap to replace nonpolar as coupling cap? at77 Parts 0 12th January 2010 03:05 AM
Lower rails for lower impedance? 95Honda Solid State 7 19th December 2007 09:59 AM


New To Site? Need Help?

All times are GMT. The time now is 08:22 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