[sdiy] Crumar Performer - keyboard mystery

[Florian Anwander]

Addendum:

I found that the suboctave comes later than the original tone, when I 
raise the attack time ("Crescendo")


Am 31.07.18 um 21:04 schrieb Florian Anwander:
> Hello,
>
> I have here a Crumar Performer for restauration which shows a strange 
> behaviour over the keyboard:
>
> In string mode some keys have an rectangle suboctave playing and some 
> don't.
> It does not matter whether I am in 8" or in 16" mode or have both 
> activated.
> In brass mode this suboctave is gone.
>
> There is no octave relation, which might have made the TDA1008 
> suspicious. Interchanging the TDA1008s also does not move the 
> behaviour to other notes.
>
> The service-manual is here:
> http://www.florian-anwander.de/crumar_performer/CrumarPerformerServicemanual.pdf
> The datasheet for TDA1008 is here:
> http://www.florian-anwander.de/crumar_performer/TDA1008_PhilipsSemiconductors.pdf
> The list which note has suboctave and which not:
> http://www.florian-anwander.de/crumar_performer/CrumarPerformerSuboctave.txt
>
>
> I have no idea where this suboctave might come from. Any suggestions?
>
>
> Florian
> -- 
> http://www.florian-anwander.de/
>
>
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