electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
Live streaming at radio.electro-music.com

  host / artist show at your time
  EdisonRex Edison's Electronic Review
Please visit the chat
 Forum index » DIY Hardware and Software » The Repair Shop
Mixing CEM filter revisions in a Prophet 600?
Post new topic   Reply to topic
Page 1 of 1 [2 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
philicorda



Joined: Jan 18, 2012
Posts: 3
Location: Tralfamadore

PostPosted: Mon Apr 28, 2014 1:34 pm    Post subject: Mixing CEM filter revisions in a Prophet 600? Reply with quote  Mark this post and the followings unread

Hello.

I have a Prophet 600, and recently installed the GliGli firmware update. It worked fine, except for voice 6, where the filter will not resonate at low frequencies.

Opening it up, I noticed that voice 6 has a revision C CEM3372, whereas all the other voices have no revision letter at all.

In the service manual it mentions that with later revisions of the CEM3372, the resistor in the resonance loop should be changed from 27K to 24K. It also says 'Old and new filters cannot be mixed on any board'.

What I was wondering is if I change just the resistor for that filter, whether it will resonate properly. The position in the circuit doesn't seem to affect anything else. By 'cannot be mixed' they may just mean that no boards would have both 27K and 24K resistors.

What do you think? Has anyone else tried this?
Back to top
View user's profile Send private message
dougt



Joined: Jun 16, 2007
Posts: 41
Location: Silicon Valley, CA, USA

PostPosted: Wed May 28, 2014 4:11 am    Post subject: Reply with quote  Mark this post and the followings unread

I don't think that will work. You should have matching revs in the same synth. I have early rev (no letter) CEM3372s available if you want to replace it.
_________________
http://www.synthparts.com
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic
Page 1 of 1 [2 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » The Repair Shop
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use