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 18th December 2006, 02:28 AM   #1
diyAudio Member
 
Join Date: May 2006
Default Filter Cap Age: When to replace?

I have an Adcom 555mkII that I'm guessing is about 15 years old. Is it time to start thinking about replacing the filter caps? I know electrolytics have a lifespan but I'm not sure what it generally is (20yrs?). Also if anyone knows a good replacement part # for the 555mkII I would appreciate it. Thanks!
  Reply With Quote
Old 18th December 2006, 11:38 AM   #2
AMV8 is offline AMV8  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: near london
Hi
I am not familiar with your speaker however I believe that you are right to think about replacing the caps in the filter after 10 years or 10,000hours use.
I am also not sure of your background in audio so I will start form the beginning and you can skip a lot of this if you already know it.
Generally you only need to replace electrolytic capacitors in the filter. Resistors and coils will be functioning ok and will not need to be replaced.
The electrolytic capacitors should all be replaced by new bipolar electrolytic capacitors. However if there are any electrolytic capacitors in the treble section of the filter these should be replaced with plastic film capacitors- polypropylene (MKP)or polyester (MKT)- the latter being a bit cheaper.
Digikey and Mouser sell the parts you need.
I hope this helps. If you need more info you can e mail me.
Don
  Reply With Quote
Old 18th December 2006, 12:38 PM   #3
diyAudio Member
 
Sonusthree's Avatar
 
Join Date: Dec 2005
Location: Sussex, UK
Quote:
Originally posted by AMV8
Hi
........ I believe that you are right to think about replacing the caps in the filter after 10 years or 10,000hours use.
...............
Totally agree Don, But, I believe Speakerguy is referring to his amp.

I'm not familiar with this model but you should definitely be considering replacement after 15 Years!!
I'm in the same situation with my Cyrus at the moment (~15 Years).
The large filter caps are the most expensive so I have started with the other electrolytics elsewhere in the amp and swapping them to Polypropylene where possible.

Your amp looks like a quality piece of equipment. What parts are fitted there at the moment? You don't want to downgrade the quality if you can help it.

Might also be worthwhile reading up on bypassing those large caps with smaller film types and the contentious issue of snubbers!!

Happy Christmas everyone.
Cheers,
Martin.
  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
replace digital filter SM5841AP for DF1704 alenzo Digital Source 11 3rd July 2012 12:07 PM
need help wana change 60-Hz twin-T notch filter to 279 Hz filter prorms Solid State 0 9th February 2008 11:38 PM
Can Zaphs notch filter be used without the BSC filter? GuyPanico Full Range 0 21st July 2007 01:27 AM
active filter from rod elliot and sub filter questions wuffer Parts 0 2nd October 2005 01:12 PM
chassis-mounted filter or IEC plug filter jarthel Solid State 7 11th March 2002 10:17 AM


New To Site? Need Help?

All times are GMT. The time now is 10:04 PM.


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