@General Lighting 505291 wrote:

European design, and doesn’t look like it requires particularly hard to find components. (I assume you must have some fairly advanced (by todays British standards) electronics skills, test equipment and workshop space….)

Open.Theremin.LC Schematic

Skills, well no TBH not advanced at all. I did PCB assembly for a few months in Panasonic 15 years ago, and assembled build to order computers for about a year, but the PCB assembly I did was mostly machine setting, and the computers was pretty much just installing plug & play expansion boards, very simple stuff. Im not bad with a soldering iron but have no diagnostic equipment at all.

I found a couple of places now that sell the PCBs so got to price up the components needed