Here’s the Octave Drone from Seppuku FX. Like the Space Fuzz, it too is based on the Rambler. In fact, the Octave Drone is more than half of the Space Fuzz. This has as input switch that goes between a 4.7nf cap and a 100nf cap, much like like the Hot Silicon Tonebender. You could easily replace the switch with a B100k pot (much like the Basic Audio Scarab Deluxe), to pan between the 2 caps. You can mount the pots on the component side to have the board mounted vertically inside your enclosure if you so choose. Should fit in a 1590B without issue.
