The Rockmodules are between 15 and 20 years old now. When you can find one, the owner doesn't always know what he has in hands and sells it as is, i.e. usually in bad condition.
Some modules just need a basic revision, but for some of them, refurbishing is a sort of resurrection that includes both electronic and mechanic operations.
You may feel like doing it yourself: it's feasible, but like everything in life, it takes several attempts to get good results. I have purchased and refurbished several tenth of Rockmodules and Rockman headphone amps during the last two years, and it took me a while before finding the right methods, parts and components.
If you own such a Rockmodule and want to use it the way it was designed for,
Perfect Sound Rock Refurbs will be pleased to refurb it for you.
Remember that the electrolytic caps must be changed after all those years: these components have a limited lifetime, and leaving old electro caps can damage the circuit. I have posted below a picture showing used caps: it's fairly explicit.
In case you need to convert a Rockmodule from 110V to 220V, or a 12VAC wall-wart Rockmodule to 110V or 220V, the conversion can be made with standard parts and is easy to do.
The most common components can be purchased from every electronic parts vendor, and Perfect Sound Rock Refurbs will help you finding the more specific parts if necessary, to include new metal enclosures in case the original plastic case is wrecked.
The pictures below show some Rockmodules I have refurbished: left column is "before", right column is "after".