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Re: Hello to everyone and OB-Xa repair questions -- Capacitor hoax

Re: Hello to everyone and OB-Xa repair questions -- Capacitor hoax

2014-06-28 by ipc.de

Dear David Forro,

I am restoring "vintage Syths for quite a while. I am using sophisticated 
equipment for testing and measuring capacitors.
But I only VERY RARELY experienced that capacitors fail. I believe this is a 
hoax. People tent to believe that doing something technically, some 
soldering, and the like, is better for their old equipment. I say. Never 
change a running system. If you want ot do something good for your old 
stuff, clean it, hug it and stop smoking ;-)  And try to avoid power 
surges...

If any, then it's the Tantalums that cause trouble. The problem with the 
Tantalums is that they suddenly turn into a short circuit - damage to the 
circuit is expectable. Be attentive to the tantalums, but forget the 
electrolytics in the first place. The risk of damaging the most sensitive 
CMOS or MOS integrated circuits of the 70ies and 80ies is evident.

Best
Mondo

Re: [oberheim] Re: Hello to everyone and OB-Xa repair questions -- Capacitor hoax

2014-06-28 by Daniel Forró

Thanks for sharing your experience, I do replacing carefully and  
sensitively.

Daniel Forro
Show quoted textHide quoted text
On 28 Jun, 2014, at 6:29 PM, 'ipc.de' ipc.de@... [oberheim] wrote:

> Dear David Forro,
>
> I am restoring "vintage Syths for quite a while. I am using  
> sophisticated
> equipment for testing and measuring capacitors.
> But I only VERY RARELY experienced that capacitors fail. I believe  
> this is a
> hoax. People tent to believe that doing something technically, some
> soldering, and the like, is better for their old equipment. I say.  
> Never
> change a running system. If you want ot do something good for your old
> stuff, clean it, hug it and stop smoking ;-)  And try to avoid power
> surges...
>
> If any, then it's the Tantalums that cause trouble. The problem with  
> the
> Tantalums is that they suddenly turn into a short circuit - damage  
> to the
> circuit is expectable. Be attentive to the tantalums, but forget the
> electrolytics in the first place. The risk of damaging the most  
> sensitive
> CMOS or MOS integrated circuits of the 70ies and 80ies is evident.
>
> Best
> Mondo

Re: [oberheim] Re: Hello to everyone and OB-Xa repair questions -- Capacitor hoax

2014-06-28 by Daniel Forró

Thanks for sharing your experience, I do replacing carefully and  
sensitively.

Daniel Forro
Show quoted textHide quoted text
On 28 Jun, 2014, at 6:29 PM, 'ipc.de' ipc.de@... [oberheim] wrote:

> Dear David Forro,
>
> I am restoring "vintage Syths for quite a while. I am using  
> sophisticated
> equipment for testing and measuring capacitors.
> But I only VERY RARELY experienced that capacitors fail. I believe  
> this is a
> hoax. People tent to believe that doing something technically, some
> soldering, and the like, is better for their old equipment. I say.  
> Never
> change a running system. If you want ot do something good for your old
> stuff, clean it, hug it and stop smoking ;-)  And try to avoid power
> surges...
>
> If any, then it's the Tantalums that cause trouble. The problem with  
> the
> Tantalums is that they suddenly turn into a short circuit - damage  
> to the
> circuit is expectable. Be attentive to the tantalums, but forget the
> electrolytics in the first place. The risk of damaging the most  
> sensitive
> CMOS or MOS integrated circuits of the 70ies and 80ies is evident.
>
> Best
> Mondo

Hello to everyone and OB-Xa repair questions -- Capacitor hoax

2014-06-30 by ipc.de

I am confident that you take due all care when you modify your instrument. 
But I am hesistant to recommend that general "Cap swapping thing" to
everyone. Be aware that less experienced readers may be prompted to 
eventually do bad to their beloved instruments just for the sake of a hoax.

BTW, did you experience any improvement over the original state. And if yes, 
where or under which circumstance?

Thanks and best wishes,
Mondo

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