- Fulltone Ocd Version Differences And Relationships
- Ocd Schematic
- Fulltone Ocd Version Differences And Behavior
The OCD uses roughly the same architecture, but with mosfets in place of the silicon diodes, these should produce a much softer 'knee' as waveforms approach the clipping point. The OCD also uses one extra diode to make the clipping more assymetrical. So the Rat would be a (hard-clipping) distortion and the OCD would be in the overdrive camp.
Original Full-Drive (FD1) - 3 dials, no boost level knob nor 'Comp Cut'.
Full-Drive 2 (FD2.1) - 4 dials, including boost level knob, no 'Comp Cut', serial number #275A.
Later, production FD2.1, in orange, serial number #645.
Full-Drive 2 (FD 2.2) - 4 dials, with 'Comp Cut' on volume pull (even though this example does not have it printed on the pedal, so it looks just like the 2.1 model, above!).
Full-Drive 2 (FD 2.3) - 4 dials, with 'Comp Cut' on volume pull, 'Flat Mids' circuit, serial number # 6629.
Full-Drive 2 (FD 2.4) - 4 dials, with 'Comp Cut', 'Flat Mids' and 'Vintage' on toggle switch, also known as the “Switchable” version.