This engraved Reverse Fat Fuzz Factory features a pair of the ever elusive transistors we affectionately describe as Spam Cans. We have used many different NOS germanium transistors in Fuzz Factories over the years - all to great effect, but none quite like that first and only tiny batch of PNP Spam Can transistors Zack found in a surplus store back in 1995. They have a sweet top end and a chewy texture like no other. This pedal uses a pair of NOS Spam Cans we unearthed recently; they are NPN which is the opposite polarity of those Zack found many years ago. We were able to use them by reversing the polarity on the other polarized parts (i.e., capacitors and diodes). What this means to you: the polarity is backwards from the more common negative tip pedal polarity. This pedal requires a positive tip power supply or a 9-volt battery. These reverse Spam Cans sound very close to the originals. It's challenging to find these semiconductors and they have to be hand tested one by one, into an extremely specific gain range. Hand wired and hand engraved with clear knobs for a smooth, clean aesthetic.