Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Peavey XR 700
Peavey XR 700
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 19th October 2017, 05:02 AM   #1
soulman25 is offline soulman25  United States
diyAudio Member
 
Join Date: Sep 2012
Default Peavey XR 700

I have a peavey xr 700 and i want to replace the caps on the power amp board . They are the old style foil caps rated at 0.1 uf. At around 50volts. They have a red stripe on one end. So i dont know the polarity of these caps. On the schematic it shows them being electrolytics . So can i replace these with newer style CAN style electrolytics ? I also need to know the polarity. Does the red stripe mean that is the negitive side or the positive side ? Dunno . please someone let me know these two questions. Hopefully Enzo will see this thread or someone with in-depth knowledge on older peavey powered mixers. Thanks.
  Reply With Quote
Old 19th October 2017, 06:25 AM   #2
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
I don't have the power amp schematic for that handy. Two 100 watt channels?

But in general, foil caps are not electrolytics, and foil caps have no polarity. Foil caps do have an "outside foil" which is often indicated by a stripe. Some guys will argue about outside foil, but in this amp I sincerely doubt it maters.

Unless they are damaged or failed, there is little reason to replace them.

I know there are electrolytics that small, but I have never seen them in a Peavey product.

Can you post your schematic here?
  Reply With Quote
Old 19th October 2017, 09:07 AM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Foil caps? There were none fitted originally.
All I can find, schematic wise, is the preamp section.
Attached Images
File Type: jpg XR700 POWER AMP.jpg (134.2 KB, 53 views)
Attached Files
File Type: pdf peavey-xr700-preamp-schematic.pdf (208.9 KB, 16 views)
__________________
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 19th October 2017, 10:24 AM   #4
Burnedfingers is offline Burnedfingers  United States
diyAudio Member
 
Join Date: Nov 2002
Quote:
Originally Posted by Enzo View Post
I don't have the power amp schematic for that handy. Two 100 watt channels?

But in general, foil caps are not electrolytics, and foil caps have no polarity. Foil caps do have an "outside foil" which is often indicated by a stripe. Some guys will argue about outside foil, but in this amp I sincerely doubt it maters.

Unless they are damaged or failed, there is little reason to replace them.

I know there are electrolytics that small, but I have never seen them in a Peavey product.

Can you post your schematic here?
I'll have to second what he has said. If it isn't broke don't fix it. One simple question for you...is it working correctly? No hum no noise? Changing caps isn't going to make this piece sound any better. Its a simple guitar amp of medium to low quality designed to provide modest performance at a reasonable price. If its working ok button it back up and use it.
  Reply With Quote
Old 19th October 2017, 05:39 PM   #5
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Jon, the power amps are a separate schematic, it is a stereo 100w/ch, but I cannot recall the card number. The few I have in my computer are not a match, I will look in my paper files when I can. The OP seems to have the schematic, hoping he will post it. Otherwise customer service at Peavey will send it upon request.
  Reply With Quote
Old 20th October 2017, 10:27 PM   #6
soulman25 is offline soulman25  United States
diyAudio Member
 
Join Date: Sep 2012
Thanks guys for all of the info . yes it is working now. The B channel was real crackerly but i found the problem on board with all of the xlr 1/4 " inputs and outputs it was a corroded 4558 op amp on that board. Someone had spilt liquid in it and corroded that op amp. Unit works great now. But i thought whilebi was in it inwould go ahead and replace those foil caps on the output board . But now i see i dont have to. I did replace the power supply caps which were 5000uf rated at 55volts with 4700uf rated at 63 volts.Again thanks for all your input. Now on to my next project which is a Crest CA 9. power amp. It had a bad channel which i found a shorted output xtor. To 262 case. Costomer wants back in stereo instead of bridged. It has no external switch for that but i called Peavey and talked to Grant the lead tech there and you have to switch it to stereo inside the amp theres 3 pins with a two pin connector and have to physically take that connector off and replace it on the other 2 pins.Wish me luck on getting it up to specs. You guys are great and it is so cool to have you guys in my pocket. Have a good one guys and good luck on all of your endeavors.
  Reply With Quote
Old 20th October 2017, 10:33 PM   #7
soulman25 is offline soulman25  United States
diyAudio Member
 
Join Date: Sep 2012
Sorry Enzo but i dont know how to post schematics. I had to call Peavey and talked to Grant to have it sent to me via Email. But man thanks for all your input.
  Reply With Quote
Old 20th October 2017, 10:35 PM   #8
soulman25 is offline soulman25  United States
diyAudio Member
 
Join Date: Sep 2012
Sorry Enzo but i had that schematic sent to me via Email from Grant at Peavey. Thanks for all your help bro.
  Reply With Quote

Reply


Peavey XR 700Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
peavey fellowesman Instruments and Amps 14 11th June 2016 06:52 AM
Peavey CS800X bsco Instruments and Amps 8 29th July 2015 01:17 AM
Peavey XR696F + Peavey Impulse 1012's...?? kecs97 PA Systems 1 4th August 2014 04:30 PM
Help with old Peavey amp xyloeye Instruments and Amps 17 18th April 2013 04:48 PM


New To Site? Need Help?

All times are GMT. The time now is 11:44 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki