Adding Stones/Stoner switch to older Catalinbread SFT?

[GAS KING]

Would this be possible?
I have the original SFT, but the stones/stoner switch would make the pedal perfect.

Anyone have an idea if I can mod the pedal and add a switch?

[Ben79]

[GAS KING]

http://homemadefx.web.fc2.com/SFT.BMP?95232643

Thanks, but I'm not really sure which is the stones/stoner switch?

I see here: http://tagboardeffects.blogspot.com/201 ... ft-ii.html

DPDT - Q1-6: MPF4393 JFET

I'm not sure how that works withing an original SFT?

[Nocentelli]

http://www.freestompboxes.org/download/ ... &mode=view

the stoner mode just requires a single wire from Q5's source to a switch and then through a 22u electro cap to ground - will give a big gain boost and more dirt.

I'm not sure whether the stones mode would give a gain boost to the OG SFT, or whether it gives a bright boost, or even gain reduction, but the input stage is slightly different in your original, so the stones mode would require some tinkering - add 10k resistor between the first two JFETs (Q1 drain-Q2 source), replace the 1u cap but connected to to the Q1 drain instead of Q1 source -still at Q1 gate at the other leg. The stones mode (another, opposite wired pole of a dpdt) connects a 4n7 cap and 470k resistor in series between Q1 gate and drain.

Check out the schematics out at freestompboxes - Trace your original (page 5 of the thread) and compare to the V2 schematic with the switch on page 15: There seems to be few changes (I assume those two scheme are correct).

http://www.freestompboxes.org/viewtopic ... &start=280

[GAS KING]

thanks!