Vintage Synth Repair

Cool...thanks for that...yeh I seem to remember
something about the tants being a problem in that
model.

Well I managed to fix a dead Quadra so I feel I could
have a go at one of these..:)

Phil.


--- Malte Rogacki <gacki@...> wrote:

> At 17:08 Uhr +0100 08.05.2008, Philip wrote:
> > On the subject of arp stuff..Ive been thinking of
> > getting an Arp Omni but how come nearly every
> single
> > one I see is broken, not working, in need of
> repair
> > etc?
> 
> There has been some discussion about this in the
> past few days. Some
> components inside the Omni are prone to failure.
> 
> Here is a good description of the two typical
> problems:
> 
> http://www.oldcrows.net/~oldcrow/synth/tips.txt
> 
> The Omni uses quite a number of series 4000 CMOS
> chips; and also a huge
> number of tantalum caps. The one I'm currently
> trying to fix had a number
> of those chips and a number of those caps blown. The
> chips are very cheap;
> and I substituted electrolytic caps for the tantalum
> caps in the gating
> circuit. This got me about halfway to a working Omni
> - all voices produce
> sound now; and the gating circuits basically work
> (there are still some
> other problems, though).
> 
> Anyway, it's a totally great sounding poly ensemble
> synth. The sound of
> those divide-down synths certainly is something
> special.
> 
> The parts are cheap and mostly generic. I'm still
> learning all this stuff
> but I consider the Omni one of the easier to
> understand synths,
> circuit-wise. So if you want to learn to fix
> something a cheap non-working
> Omni might be a ticket.
> 
> -- 
> Malte Rogacki gacki@...
>
----------------------------------------------------------------------------
> "Don't forget to TURN ON THE SYNTHESIZER. Often this
> is the reason why you
>  get no sound out of it." (ARP 2600 Owner's Manual)
>
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> 



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