FF: PNP Ge to NPN Si?

[brrt]

I've got a pretty new fuzz face (the one with the switch soldered on the PCB). This is a PNP germanium Fuzz face with negative ground (NKT275 reissue). I'd like to modify it with NPN Si BC108 transistors, but i'm not shure if this is possible without changing polarity of the battery and/or caps.
Has anybody experience with this? Can I just swap in the BC108 transistors? Or, when I have to switch the polarity of the battery, can this be done without trashing the pedal?

greetings,
Brrt

schematics:
http://www.generalguitargadgets.com/diagrams/fuzzface_sc_nn.gif
http://www.generalguitargadgets.com/diagrams/fuzzface_sc_pn.gif
http://www.generalguitargadgets.com/diagrams/fuzzface_sc_pp.gif

[petemoore]

Polarized caps + side always go to the most positive connection point they have in the circuit.
 NPN = Neg Gnd [of course polarized caps - goes to - or Gnd.]
 PNP  = Pos Gnd [Polarized cap and battery V+ go to ground]
 {Otherwise yer talking PNP Neg. Gnd [Ge or Si].... I won't recommend].

[brrt]

This Dallas Arbiter Fuzz Face IS PNP neg. ground! It's the one with the thermistor inside to reduce therminal effects. And I'd like to change it to NPN Si neg. ground...

[petemoore]

It should be very quick and easy to get your board to follow an NPN Si Neg Gnd. schematic.  GGG, ROG, many other sites have them.
 I'd trimpot Q2C resistor, and the transistors, and...