[sdiy] cv out leaking?

[Carlos Portela]

Hi John. Thanks for your valuable info . I took 2 of the 2sk30a to test them. One from gate kbrd cv and other from lfo. Because they look good I switch them and solder. 
I took the opportunity to resolder the gate kbrd cv area. 
Its working again. The cv holds a lot better. Maybe more then 5 min to drop a semitone.
Do you think will eventually happen the same if i dont change the ic2?

Thanks


> On 13 Nov 2014, at 00:19, John Henson <synthnerd at eircom.net> wrote:
> 
> Hi All,
> I have fixed several SH09's over the last few years, and a quick perusal of the the service docs refreshed my memory. The IC in question is IC2, an LM13741 from Nat Semi. I would suspect this is the culprit.
> A TL081 is not quite good enough but a CA3140 is. Even though the original chip is in a can it has the standard DIP footprint. Take the old chip out, new chip in a gold plated turned pin socket (or not), clean all flux off with Isopropanol and the problem should be sorted.
> It has worked on all the SH09's here that have had sample and droop.
> 
> John.
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