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

[rsdio at audiobanshee.com]

The whole damn synth is 40 years old. By that logic, you'd be better off replacing the whole thing!


On Jan 31, 2016, at 2:04 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 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.