Thunderchief Q2 bias problem

[Mihkel]

Alright, I have wired up the Thunderchief with the original tonestack as shown here: http://www.runoffgroove.com/tc-tone.png and have set the drain voltage to 4,5V on all fets except Q2. Turning the trimpot only makes a 0,1V difference, as does a 100k fixed resistor.

Any ideas would be greatly appreciated.
Thanks

[Mihkel]

I should add that I accidentally connected the power supply with the wrong polarity at first, but fixed that. Could it be that just one FET bit the dust because of this?

[RDV]

Did you socket the FETs? If not, I would. I had trouble with Q3(which would be Q4 on the schem you're working with) myself which I solved with a fix from FAQ on the ROG website.

RDV

[Mihkel]

Changed the FET, same problem.
Should I try using a smaller resistor instead of the 1k?

[syndromet]

I had the same problem with my Fetzer-valves. I found that connecting the 9+ to lug 1 on the trimpot, lug two to the jFET and lug 3 to ground made me bias it correctly. I guess this would work here too.

[Mihkel]

I go to check that resistor out and what do i discover?
I have no 1k resistor in there!
*smacks head*
I installed a 2k2 resistor, the closest value to 1k that i had on hand, and it biased correctly.
Still, theres no sound coming out of this thing.
Touching the gates of the fets after Q2 makes a buzzing sound.
It's probably the fet though, I don't really have any new ones left, just old ones that might be dead.