identify coupling capacitor in Rotel RA-820BX2 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

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
Reply
 
Thread Tools Search this Thread
Old 22nd July 2010, 02:33 PM   #1
zog666 is offline zog666  Australia
diyAudio Member
 
Join Date: May 2009
Default identify coupling capacitor in Rotel RA-820BX2

Hi,
I've just been looking into an old amp of mine (now sold to a friend) to replace the capacitors as the electroytics would be getting pretty old now.

I was able to find the service manual from:
http://www.bwgroup-support.com/rotelservicemanuals.html
which is very handy!

Tracing the circuit I can see 2 coupling capacitors where the line level inputs go in, 1uF rated.. but the type is not mentioned and they aren't familiar to me (but I'm a bit of a newby at this). These are C602 and C601 in the diagram by the way

Anyone know what these kind of capacitors are? -

Click the image to open in full size.

(the blocky silver one in the middle)

.. and the follow on question, how good are they (should I bother replacing them)
  Reply With Quote
Old 22nd July 2010, 02:48 PM   #2
diyAudio Member
 
jackand08's Avatar
 
Join Date: Oct 2008
Location: England
These capacitors are multilayer type capacitors with an open construction (not sealed in resin or anything like that). They are an older type of capacitor and if you are replacing the rest of the caps, you may as well do these too. Although they probably won't have gone out of tolerance and will be fine, its best to replace them anyway. Multilayer type capacitors are dirt cheap these days and shouldn't be hard to find.
  Reply With Quote
Old 22nd July 2010, 03:29 PM   #3
alexcp is offline alexcp  United States
diyAudio Member
 
alexcp's Avatar
 
Join Date: Jun 2009
Location: Florida
Blog Entries: 37
This cap looks like a Metallized Polyester Film (MKT), e.g. Epcos B3256x (see http://www.epcos.com/inf/20/20/db/fc...B32560_564.pdf). Should be replaceable with any good MKT or better MKP cap.
  Reply With Quote
Old 23rd July 2010, 12:34 PM   #4
zog666 is offline zog666  Australia
diyAudio Member
 
Join Date: May 2009
ok, thanks.. got a bag of red WIMA MKP10 0.47uF caps here, 2 of those (= 0.94uF) should make a nice replacement.

for what it's worth, heres a peep inside the amp (leaving off the phono stage which is 1/4 of the PCB but I'm not interested in)

Click the image to open in full size.

Last edited by zog666; 23rd July 2010 at 12:37 PM.
  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
Rotel RA-920AX tooch Solid State 31 15th May 2011 06:36 PM
HELP! Rotel RA-1062 kchu1377 Solid State 56 9th January 2010 02:28 PM
Rotel RA 931 argonrepublic Chip Amps 0 20th April 2009 01:26 AM
schematics of Rotel RA-971mk11 / RA-971 digitaldiablo Solid State 0 12th June 2003 04:03 PM
Rotel RA-820B jean-paul Solid State 0 9th December 2002 08:00 AM


New To Site? Need Help?

All times are GMT. The time now is 05:19 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