Crumar Musical Instruments User Group.

Good idea Margus. I was thinking of doing something like that. I 
suppose the pins will be different. I was thinking of making a small 
wire-wrap board with the other chip and an empty 14-pin socket that 
would plug into the empty 4727 socket. Is that what you are thinking?

But I still think someone must have some of those chips sitting in a 
dusty old bin somewhere, or in a deceased crumar keyboard!

floyd--- In crumar@yahoogroups.com, "Margus Kliimask" 
<margus.kliimask@m...> wrote:
> Sorry, no idea. Maybe you can find a substitute, a counter should 
be quite a
> trivial thing. For example, ARP Omni uses 4520 (which is also 
CMOS), they
> should be readily available. As to why there's only ten of them, I 
have no
> clue. Check again, you should have two more :)
> 
> Regards,
> 
> -----Original Message-----
> From: Floyd Smoot [mailto:tubetater@y...]
> Sent: 29. October, 2003 01:50
> To: crumar@yahoogroups.com
> Subject: [crumar] Re: New Owner of an OTR/Orchestrator
> 
> 
> you are exactly right, margus! In my Orchestrator the chip is a 
4727,
> which i think is a cmos counter. Any idea where I can buy one? I 
have
> struck out so far.
> 
> funny thing is I only see 10 of those chips- seems like there should
> be 12.
> 
> Thanks for your help!
> 
> floyd--- In crumar@yahoogroups.com, "Margus Kliimask"
> <margus.kliimask@m...> wrote:
> > I don't know about OTR keyboard (does this stand for Orchestrator?
> which is
> > actually Multiman) but in these 'organ-style' keyboards the sound 
is
> > generated by TOS (Top Octave Synthesizer chip which generates all
> 12 base
> > frequencies) which are then divided down by divider chips for 
lower
> octaves,
> > one for each note (12 altogether). In my Performer this divider
> chip is
> > TDA1008, I bet one of your dividers is either dead or
> malfunctioning. You
> > can try swapping the C note divider (should be the first one from
> left) with
> > another one and see if the dead note moves to another note.
> >
> > Cheers,
> > Margus
> > Service.
> 
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