phase 90 trim pot quicky

[Papa_lazerous]

OK I did some searching and I couldnt get what I was looking for, the 250k trimmer on the phase 90 is there a voltage I need to measure when setting it or just tune to taste?

I am getting a very good phase at present but it varies in character when I change the trimmer I just wnat some kind of reference point to set it to if there is one

Cheers

[R.G.]

There is good way to know ahead of time. That pot sets the amount of back bias on the phasing JFETs to get the best phasing sound. There's probably a way to figure it out mathematically given that you know the Vgsoff of the JFETs, but it's far simpler to set it where it sounds best.

[Papa_lazerous]

Thanks RG your a saint, I was pondering on this for a little while, only on bread board right now as I am looking to incorporate a few tweaks before I fire up Eagle and make a layout.  you got to love Xmas yo get plenty time off work to build