I don't think the OB-8 has individual voice boards, rather it has a
big mother-board. Don't even think about trying.

The OBX-A boards are just a plug-in and a 8 or so screws, as I
recall, no soldering. You have to use the OBX-A boards, don't try
anything else (unless someone corrects me and tells you you can use
an OB-SX board.)Also, you have to make sure the OBX-A knows you have
8 voices installed. According to the service manual, you have flick
a small toggle switch on the OBX-A to turn the voice on: "On the
front of the OBXa [after you open up the top pannel] is a 8 position
DIP switch. This switch is used for voice selection, it is
labled "VOICES". If the switch is down (the open position) that
voice is off. Position 1 is for voice one, position 2 is for voice
two, and so on." This is really easy to do so just make sure you
flick the switch up.

Good luck in finding the 8th voice - but I would not be to worried
about running the board in 7-voice mode. If this is your only
problem be thankful. I run 7 voices on my 8 voice OB-X most of the
time.

--- In oberheim@yahoogroups.com , "L8RDOOD" <nansbears@...> wrote:
>
> --- In oberheim@yahoogroups.com , "nelsonj_sce" <nelsonj_sce@>
> wrote:
> > That's good to know they're all the same. To replace/install a
> board, is it just a matter of plugging it in or is there soldering
> involved Do you happen to know if an OB-8 board is the same as an
> OBX-a board(can I switch them) I'm asking this in case I cannot
find
> a board for the OBX-a, then maybe a OB-8 board will work the same.
> Plmk if you know and thanks again!
> > All the voice boards are the same.
> > The general number convention is voice 1-4 are on the bottom,
> voices
> > 5-8 are on top.
> > Running as a 7 voice is no problem, but you will only get 3
voices
> > rather than four when you split the board (the other end of the
> split
> > will have 4 voices) , but when you double, some strange things
> might
> > happen - I have never tried it.
> >
> >
> >
> > --- In oberheim@yahoogroups.com , "L8RDOOD" <nansbears@> wrote:
> > >
> > > I'm somewhat of a novice so forgive me if my questions
> > seem "ignorant".
> > > I bought off Ebay quite awhile ago an Oberheim OBX-a. I got it
> > cheap
> > > because the seller said it was "dropping a sound". Not knowing
> any
> > > difference at the time, I thought it would be cool to have a
> > vintage
> > > synth to "restore" as a project. Well, due to several unforseen
> > > situations, I wasn't able to get on the project so I put it off
> for
> > a
> > > year. As I researched, I found the contacts needed to be
cleaned
> &
> > the
> > > keys leveled, among other things. Since my time for this was
not
> > going
> > > to be like I thought, I decided to take it in to a repair shop
in
> > L.A..
> > > It took quite a while but the repairman said it was missing
a
> > voice
> > > board. To get all the work done, he wanted nearly double what I
> > even
> > > paid for it so I decided to pass on getting the board for now.
So
> > now
> > > it's a 7 voice synth. I had the contacts cleaned anyways and I
> will
> > be
> > > picking it up this week(minus the missing board).
> > > Here goes the questions: Are all the voices the same If
not,
> > are
> > > they numbered or named so I know what to get Does anyone on
this
> > list
> > > have any boards available to sell Is this even worth my time
to
> do
> > > this If anyone has done this in the past, please help if you
can
> &
> > > thanks for all your help in advance!
> > >
> >
>