Module is available as a DIY project only.
No info about availability.
Dual passive ring modulator
Two ring mods in a 4HP module. Classic transformer-and-diode design, using MIL-spec miniature audio transformers and 1N695 germanium diodes. Powered by the input signals, no separate power connection; in synth electronics this is called a "passive" module for that reason, despite the presence of active components.
Schematic, PCB layout, build instructions, and so on are available for download from the module's Web link.
https://northcoastsynthesis.com/pages/synth-diy-projects#msk003
