Vintage Synth Repair

> > I will have to recap my cs-70m's power supply (still working 
> > fortunately), because it's all original and it takes some time for it 
> > to warm-up (too long actually), and the volume pot is noisy when you 
> > turn it, but it's not a dirty pot because noise almost disappears when 
> > the synth is warmed-up.
> >
> 
> Interesting - maybe it is some sort of oxidization that is 
> temperature-dependent?  Sounds like you should break out /your/ scope 
> and measure the power rails at that point ;-)

I don't think so ;-)
As I said, it works quite nicely already, why should I bother NOT changing the capacitors and thus investigating elsewhere ? :-)
The CS had the majority of his life in south France where the climate is nicely dry, helping avoiding storage oxidization.


 
> > I want to install the kenton midi kit that I have for it, but will do 
> > once everything -or at least the psu- be properly recapped...
> >
> 
> I had a look at that MIDI kit - looks like it will cost me around 
> AUD$600 to buy, which is a lot, especially factoring in that I have a 
> whole pile of gear I'd ideally like to get converter kits for. I'd be 
> interested in hearing what others who have one installed have to say (or 
> if anyone has one they'd like to sell me for less than that much.)


Well I paid that kind of money for it. It is expensive that's for sure, but there isn't any alternative. Plus it's such a limited production that the people who buy it, do install it (quite logical indeed). Kenton used to sell this kit back in their heydays then stop producing it. They made a new production run thanks to a group buy initiated buy Analog Sweden. It allowed for me to be able to put my hands on one of these kits. What they sell on their website should be what's left of this group buy (me think). So finding one second hand out in the wild would be very hard if not impossible to say the least.


> > You just don't want to open those beasties to often ;)
> >
> 
> In general I agree, but I have to say the CS-70m power supply has been 
> pretty convenient to work on.  The leads from the transformer are long 
> enough that I've been able to leave it connected to the "DC" board with 
> that board sitting outside the case, nice!  I'm not so impressed with 
> the exposed incoming AC supply lines on the rear panel switch PCB 
> though, best keep fingers away from there :-\
> 
> Cheers,
> A.
>


Will keep my fingers away....thanks for the tip ;-)


Vincent.