What value is this Capacitor? - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 25th May 2012, 10:26 PM   #1
Jclay85 is offline Jclay85  United States
diyAudio Member
 
Join Date: May 2012
Default What value is this Capacitor?

Hi all, I just picked up an old National Westwood amp.

Click the image to open in full size.

Opened it up and noticed a little leakage from one of the caps. I want to go ahead and replace it but I'm having a hard time finding one of the same value. It looks like a 50v 35mfd. Might I be reading this wrong and it's actually a 5.0 volt? Is there any way to test its capacitance?

Thanks for any advice!
  Reply With Quote
Old 25th May 2012, 11:45 PM   #2
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
The4 value of any electrolytic cap in a guitar amp is not going to be critical.

That is 35uf and 50v. In the old days you would see MFD for microfarad. The greek letter mu in lower case is that symbol that looks like a "u". We now use that instead of M.

35 is not a standard value, so look for similar value in the standard number sequence. 33uf perhaps. 50v is a common rating, but if your supplier doesn;t have 33uf in 50v, look in 63v.

Do you know what this cap does in the circuit? If it is some sort of filter cap, 47uf would be fine, and more common than 33uf. And even if it is a cathode bypass cap, the difference between 35uf and 47uf is not much.
  Reply With Quote
Old 26th May 2012, 02:32 AM   #3
Jclay85 is offline Jclay85  United States
diyAudio Member
 
Join Date: May 2012
Really appreciate the info man. Ended up finding a 33uf @ 50v. I believe it's just a coupling cap. Went ahead and got new filter caps as well so hopefully she'll be singing nice and clean. There's a good chance I'll be back shortly as I dig in to this project some more. Definitely appreciative of the help'
  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
mkt capacitor vs mylar capacitor Vrystaat Solid State 1 28th March 2012 09:18 PM
Help needed - reservoir capacitor after reservoir capacitor wwenze Power Supplies 8 29th October 2010 02:16 PM
Best Capacitor hifive Class D 16 1st May 2009 05:36 PM
Capacitor Help MorePower7701 Solid State 8 25th July 2007 07:41 PM
Capacitor Christian Swap Meet 0 2nd January 2003 07:49 PM


New To Site? Need Help?

All times are GMT. The time now is 04:35 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