[sdiy] Crumar Performer - keyboard mystery

Florian Anwander fanwander at mnet-online.de
Tue Jul 31 21:04:48 CEST 2018


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:
The datasheet for TDA1008 is here:
The list which note has suboctave and which not:

I have no idea where this suboctave might come from. Any suggestions?



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