[sdiy] OB-Sx auto tune clock query

[Oakley Sound]

The OB-X and OB-Xa use a 2.45MHz clock as a reference for their auto 
tune circuitry. So seemingly does the OB-Sx - it's there on the 
schematics. But I have seen two OB-Sx units with the auto tune clock 
connection's trace cut and then hand wired to the 4.9MHz master clock 
instead.

Can anyone, Michael perhaps, confirm what frequency should be on pin 10 
of A69?

There is a later 1458B control board which may have this mod built into 
the board layout. Mine's an earlier 1458A board, although fitted with 
the three 56 preset C EPROMs, and it had the modified 4.9MHz clock.

Tony