Discussion about the Korg PolySix synthesizer

Thanks Don, I'll trace legs on old board and try route of using old ones.  I think I have 2sc945 here as well, so I can always go that route if need be.

Cheers and thanks for the 390x heads up

DAve

--- In PolySix@yahoogroups.com, "backshall1" <backshall1@...> wrote:
>
> You must be very careful using 2sc or 2sk transistors in place of 2N. The
> pins are usually different. EBC on 2N and ECB on 2SC. If you are prepared to
> install these with crossed legs, they can be used.
> 
> We did notice a problem with the 2N3094 for Q5. On the first note you press,
> there is no MG delay when there should be. All subsequent notes have the MG
> delayed as they should. If you stop playing for a few seconds, the next note
> will not have a delay on the MG. Very strange. We fixed it by reusing the
> 2SC945 from the old boards. I notice you have a different transistor in Q5.
> I guess you will have to try both your old transistor and a 2N3094 to see if
> there are any strange delay problems. I haven't heard anything good or bad
> about the other transistors. The 2SK30GR should be fine as long as you can
> find a pin-out diagram for it, or trace the old board back to see what pin
> is connected to what.
> 
>  
> 
> Don Backshall
> 
>  
> 
>   _____  
> 
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> raisinbag69
> Sent: Monday, March 04, 2013 8:33 PM
> To: PolySix@yahoogroups.com
> Subject: [PolySix] Trannies for Jed's Board
> 
>  
> 
>   
> 
> Ok I'm almost finished my rebuild of battery corroded board using Jed's
> replacement. All that is left are transistors to solder in. Following his
> BOM it calls for 3904 and 3906 for Q2,4,5. I have plenty of those but was
> wondering if reusing the C2785 for q5 and A1175 for Q2,4 would make it work
> any better? 
> 
> Also, in Q1 on original board, I have a 2sk30GR. Bom says it is supposed to
> be a 2N3819. Can I use a 2sk30 on the Jed board for Q1? I have a bunch on
> hand OR can use the one on old board. (BOM says try a 2n7000)
> 
> I am mostly curious what has worked for other people. it is just as easy for
> me to desolder old ones as it is to pop in 390x and a 2sk30.
> 
> Thanks
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>