Mains Hum - Are cheap caps worth it? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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
Thread Tools Search this Thread
Old 8th September 2011, 08:42 PM   #1
diyAudio Member
Join Date: Sep 2011
Default Mains Hum - Are cheap caps worth it?

Hi, thanks to the help of the forum I now have a working 405 clone. All I need to do now is up rate the power supply capacitors to 10000 uF 63v. I've seen cheap ones on Ebay but they look rather small. Is size important? Do you get what you pay for? I feel I know the answers already but - any advice gratefully received!
  Reply With Quote
Old 8th September 2011, 10:16 PM   #2
SY is offline SY  United States
On Hiatus
SY's Avatar
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 2
Make sure that your hum is actually coming from the power supply ripple and that your grounding is impeccable. Given that, I would be VERY leery of buying cheap caps from China. I would stick to high reliability caps from first-tier suppliers, and sourced through reputable distributors (i.e., not some no-name counterfeit-flogger on EBay). Here in the US, a 10,000u 63-75V cap from Digikey runs $5 or so- why risk your amp to save a dollar or two?
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 8th September 2011, 10:59 PM   #3
jaycee is offline jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
No it's not worth it. They will under perform and probably fail quickly. Go with the Panasonic TSHA range which you can buy from CPC or Farnell.

Having said that, I have bought BHC Aerovox and Cornell Dubilier capacitors from eBay without trouble, but they were not from Chinese sellers.
  Reply With Quote
Old 9th September 2011, 05:26 AM   #4
diyAudio Member
digits's Avatar
Join Date: Apr 2011
You can also order from RS components in the UK, they offer free next day shipping.
  Reply With Quote
Old 9th September 2011, 06:42 AM   #5
djk is offline djk
diyAudio Member
djk's Avatar
Join Date: Feb 2001
Location: USA
"Is size important?"

Yes, ripple current ratings are related to the size. Smaller caps have smaller ratings.

"Do you get what you pay for?"

Usually, yes.
Candidates for the Darwin Award should not read this author.
  Reply With Quote


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
Mains hum on a guitar effect unit! Help (circuit enclosed) HankMcSpank Instruments and Amps 10 18th March 2009 11:44 AM
mains hum prob polyal Analog Line Level 3 26th March 2008 02:41 PM
diagnosing mains hum baldy Solid State 3 17th October 2007 01:16 PM
BBC modded Quad 405s - mains hum spwyatt Solid State 4 2nd October 2006 09:18 AM
Zapulse mains hum since going dual mono ewildgoose Class D 11 26th December 2005 08:52 AM

New To Site? Need Help?

All times are GMT. The time now is 10:02 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2