Biasing M800

[Chaoz]

Hi everyone, noob builder here with a couple of questions,
Nearing completion of my second build, first was a Golden Falk with the bias voltages printed on the board with measuring points
Second build is an M800 with no indicators, I take it you measure voltage from the gate but I'm not sure what that voltage should be for each transistor, if someone could provide me with these that would be excellent as there is nothing in the build documentation, even better would be to let me know where to find this information for future builds ( I can already see this hobby getting way out of control - haha )
Thanks - KT

 

[temol]

I take it you measure voltage from the gate

You have to measure drain voltage, not gate. Start with half of the supply voltage. So dial around 4.5V on a drain of Q1, Q2, Q3, Q5, Q6. Then you can experiment.. go up or down 1V in 0.2V steps, one transistor at a time. Find your own settings.

 

[music6000]

As temol described, Note that Q4 has fixed Voltage!
The internal Tone trimmer is for fine tuning the overall sound of the pedal.
It is critical to adjust this, seems to be around 9.00 O'clock to 10.00 O'clock ie 7.00 O'clock being full CCW!