OBERHEIM SYNTH

Congratulations!!!!

A former OBXa owner who gave his away..........

Charlie


On Feb 21, 2011, at 8:10 PM, FL_799 wrote:

> Just want to share a little restoration project.
>
> My obxa was getting really unstable after about 30 minutes of  
> playing. Autotune would fail voice cards the whole thing was getting  
> WAY out of whack. The cards were just not uniform sounding any  
> longer no matter how much they were calibrated. Something had to be  
> done.
>
> Over Friday night and Saturday morning, I recapped the PSU and the 7  
> electrolytic caps on all 8 voice cards with Nicholson capacitors  
> exactly as listed in the schematics i.e. 15uf/25v caps on the voice  
> cards. Also replaced the 2 100uf caps on each of motherboards and  
> few 6.8/35v tantalum caps. I bought 16 100k trim pots for the  
> oscillators but they are too small to work so the originals stay  
> until I find better (suggestions?).
>
> After recalibrating the cards, I have a solid 3 days putting the  
> obxa through its paces and have several hours of sheer pleasure  
> without a hitch. It's running and sounding great. I actually screwed  
> down the lid and have not had to get under the hood so I'd say this  
> mission was a success. Maybe I'll do the control boards in a few  
> weeks and go all the way.
>
> So everything is just about done. Everything is functional, board  
> level, new bushings installed, and it sounds great. Life is indeed  
> good.
>
> James
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