BSIAB 2 bias for Q5

[alfafalfa]

Hi,

Built yet another BSIAB 2  with  mods and  one of them was  to change Q5 from a 2n5457 to a J 201 fet
for a better sound . However I can't get the bias right , according to the chart on General guitar gadgets it should be  3.4 volt  on the drain and the  100k trimpot  will only go as low as 7.17 V.
The thing sounds very good  .. but is this okay , I thought it should be around half supplyvoltage !!
Is it because I used a different fet ?

Alf

[zeta55]

I built one with all J201:s. Had no problem biasing the last one to 4,5V, however I used 200K trimers. Try adding a 100K resistor with the trimpot.

/Krister