Another classic. Not much info on this one either. It’s super rare, just like 99% of the Hornby Skewes pedals. Essentially, it’s a set booster that you can switch between either bass or treble boost. Rumor has it that it was used by Ritchie Blackmore during the 1960s up until 1974, as well as Jethro Tull on Aqua Lung. Schematic is over at FSB.
Layout 1: Original (PNP)
Layout 2: NPN
