Vintage Synth Repair

>First off:  I have a Crumar Bit One in really nice shape except for
>the fact that there is a scratchy noise associated with the first
>voice.  Even when I swap the chips out, it's always the first voice so
>must be a problem with something other than the chip.  I'm wondering
>if this is common or if anyone may have any insight into fixing this.

You'll have to do some clever signal tracing.  Try running it with chips 
removed to see approximately where it is in the signal path.

>Second:  I have a Siel DK80 that only seems to work when it wants to.
>It was working just fine one evening, but when I moved somewhere else
>and came back, the display was off and the unit would no longer
>sound.  When amplified, you can hear power running through it as you
>turn it on or off, but it won't light the display or output any
>sound.  I am wondering if this could be a battery issue, or if I am in
>deeper trouble than that.  If it could be the battery, I was wondering
>if anyone knew what kind of battery the DK80 took before I desolder it.

In my experience, it's probably just because it's made by Siel.  I think 
they're equipped with some kind of self-destruct device.

If you're lucky, the battery is a standard 3V lithium.  But at least for 
some of their synths, they used NiCd batteries that leak after a while (like 
the Polysix)

_________________________________________________________________
Interest Rates near 39yr lows! $430,000 Mortgage for $1,399/mo - Calculate 
new payment 
http://www.lowermybills.com/lre/index.jsp?sourceid=lmb-9632-18466&moid=7581