[sdiy] [AH] Arp Solina with excessive chorus noise

[Chris Juried]

Agreed, Tom. Strap an ESR meter to those caps and watch the resistance shoot up. Replace them and watch you AC ripple fall.  Sincerely,   
  Chris Juried  
Audio Engineering Society (AES) Member  
InfoComm-Recognized AV Technologist
http://www.JuriedEngineering.com (Juried Engineering, LLC.)

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      From: Tom Wiltshire <tom at electricdruid.net>
 To: rsdio at audiobanshee.com 
Cc: "synth-diy at dropmix.xs4all.nl diy" <synth-diy at dropmix.xs4all.nl>
 Sent: Sunday, January 31, 2016 5:04 PM
 Subject: Re: [sdiy] [AH] Arp Solina with excessive chorus noise
   
I don't see what's "premature" about putting fresh caps in the power supply of something from the 1970's. Those caps are probably 40 years old!

Tom

On 31 Jan 2016, at 19:30, rsdio at audiobanshee.com wrote:

> Just say "no" to premature re-capping.
> 
> On Jan 31, 2016, at 11:21 AM, <tprivitera at nc.rr.com> wrote:
>> I recently picked up a 70's Arp Solina String Ensemble. It has the button on the right cheek block to turn the chorus on/off and it is not the later version with LEDs.
>> 
>> It's in pretty good condition, every function works and it sounds great, but there is, in my opinion, excessive noise and 'swooshing' when the chorus/modulation circuit is engaged.  It is dead silent with the chorus turned off.  Not a big deal when you are playing notes or chords, but enough to be annoying when it's idling.
>> 
>> I downloaded the service manual/schematics and it looks like there are adjustment pots on the modulation boards.  Anyone had one with a similar issue adjust these or can suggest some ideas to reduce the noise?  I will be re-capping the power supply later this week for preventative maintenance, as I do with all my synths, combo organs, etc.
> 
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