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ok. in the next few days I will try to change the values ​​of some resistors to try to further lower the negative voltage.

Good morning Barry,

Thank you for your reply, I have checked several times the empty PCB and the assembled one by comparing them with the diagram and using the multimeter in continuity mode.
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Good morning everyone,

After building a clone of the kondo M77, which is electrically finished but I haven't built the case yet (don't worry I'll post everything in the dedicated post...

Good evening everyone.
My name is Luca and I write from Italy, precisely from Liguria.
I have a small audio system consisting of a self-built t-amp and a Madison MAD-TA10BT integrated which was...