"how different is the Sontec from the Manley massive passive, sound wise and layout- construction wise ?"
They have almost nothing in common, one is active the other passive, one use opamps as filters, the other inductors and capacitors, one is DC coupled the other has capacitors and transformers in the signal chain.
Are there holes on the PCB for the feedback compensation cap?
Nope, but they're easily soldered on the solder side in parallel with the feedback resistor.
Congratulation Fabio.That was the right answer. :grin:
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