Oberheim OB-1 /ca3080e filter question

[Tony Clark]

> >just a quick question.
> >Looks like some of the Ca3080E ic's in the filter section of a friends OB-1
> >are going to need changing . They seem to be colour coded ? Anyone know how
> >these were selected or can I just use a standard Ca 3080 IC ? 
> >regards  Peter 
> > South London England 
> 
> Since Synthfool just unsubbed, I'll try to help (only because I just 
> heard some info about the venerable 3080). If my info's correct, replace 
> these with parts that have the letter E at the end. It was a slightly 
> different model, in terms of performance. I think it was Batz who posted 
> this info...

   One thing is for sure, Oberheim did indeed have a specification for 
matching the 3080's that went into the old synths.  My OB-X's are chock 
full of orange and yellow dotted 3080's.
   While I was building my LFO circuits a few months back, I discovered 
that some of the 3080E's are indeed different, different enough that I 
couldn't use them in my design! (Well...not without modification).  
Anyhoo, I don't have any documentation regarding matching 3080's so I 
can't be of much help in telling you how they did it.
   Most likely you won't notice much difference, but then again...

   Tony

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I can't drive (my Moog) 55!
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Tony Clark -- clark at andrews.edu 
http://aupe.phys.andrews.edu/~clark
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