Discussion about the Korg PolySix synthesizer

Well spotted! I am just sitting here in front of an original and the ceramic
disk is marked Œ471¹ (470pF), so yes, you are right. Jed: Can you change the
parts list on your site? I am imagining that the wrong value capacitor would
quite severely change the shape of the input waveform and this is why you
have to drive it very hard in order to get a tape load. And I just though my
laptop and the input had an impedance mismatch!

Cheers,
Andy


On 04/12/2010 10:01, "Malte Rogacki" <gacki@gacki.sax.de> wrote:

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> Hello;
> 
> I've noticed that I needed to use a very high level to load sounds "From
> Tape", much higher than with the original boards.
> 
> C4 is given a 0.047uF ceramic in the parts list; on the original boards it
> is 470pF. Exchanging this cap made loading "From Tape" much easier.
> 
> The mistake may stem from the service manual which has two caps marked C4;
> the "real" C4 (470pF ceramic) is the one parallel to R5; while the one in
> series with R28 is C5 (0.047uF plastic film).
> 
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