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Thank you for your help, I'll try to clean a bit with Isopryl in the next days (I don't have it at home and shop are closed for Covid). If this does not work i could try to remove and check the transistor and substitute them later: Do you think that install pin headers could be a nice idea to...

Here there are some photo: I can take more if they are not good

Voltages of IC1: pin 1 - 6.82V pin 2 - "strange" started from a value and goes near to 0 (stopped at around 0.07V) pin 3 - 2.27V pin 4 - 0.00V pin 5 - 0.20V pin 6 - "strange" started from a value and goes near to 0 (stopped at around 0.07V) pin 7 - 9.14V pin 8 - 8.07V

The voltage on IC1 pin 6 is near to zero (both with OCTAVE engaged and not engaged) and moving the octave pot does not change this value

What do you mean? What happens to what specific part? Thank you very much for your time for now! For today I quit because here in Italy it's very late now :)

The voltage on IC1 pin 6 is strange, it starts from more than 8V and decrease to 0V and then it restart

The GE diodes are the 1N34As found on Tayda (these: https://www.taydaelectronics.com/1n34a-1n34-germanium-diode-do-7.html) Correct measures: Q1 pin 2 - 0.70V Q5 pin 2 - 0.68V

Hi @Chuck D. Bones thanks for replying me! I removed the two GE diodes to change their orientation and installed four round pin headers: actually the GE diodes are placed in the "wrong" position but thanks to the pin headers I can now turn them as I wish. Just to be sure: for measuring "Q1 pin...

Hi, I have some problems with the Parentheses Fuzz: The Boost section works perfectly; The Octave section does not work - ON or OFF the sound does not change; The Fuzz section does not work - when it is turned ON the sound disappear. Some notes to help you to understand: I have not yet...