IBZ60 & 100, may be close enough....
While i am not familiar with the IBZ30EQ, the only difference "may" be the power amp rails are lower for a 30W amp compared to a 60W or 100W amp
Thank you very much. It seems that the only difference is the power amp build on STK077. The rest of the circuit is the same.
EDIT: a photo of the amp (already fixed):
All pots in the graphic equalizer failed. I was not able to buy them so I disassembled them, fixed and assembled back.
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