Univox CO-105 Uni-Comp

 A quite simple old japanese compressor by Univox. For part substitutions (since stock parts is long gone obsolete...) the transistor were a low gain NPN silicon so PN2222 or 2N3903 should work. MD234 were silicon signal diodes so 1N4148s is a near enough sub. The spec of the original vactrol remains unknown so socketing a LED/LDR combo seems to be a wise decision.

Schematic, gutshots and info at FSB.

Univox/Shin Ei UD-50 Uni Drive w Aion "Monad" mods

This one has been modified for regular stompbox use and more useful controls. Also a feedback trimpot has been added to achieve more gain on tap. Aion's Monad projects suggest a 10k trimpot but I suggest a much larger value to be able to turn it into a heavy high gain fuzz.

Shin Ei / Univox SQ-150 Square Wave