On Sunday, July 29, 2018 at 7:51:39 AM UTC-6, wrote:
I liked the subtle ticking noise of ye olde RICO VACS vario I had in the HP-14. And it was very good at pointing out weak lift. Alas that relic from the 1970s stopped working some time circa 2000. I sent it to its maker and he fixed it, but it later failed again, as has another unit I scrounged somewhere. So I have two of those sitting on the shelf. I'd love to get the schematic and try and revive it. Or build an equivalent audio-only unit. Is it possible to get the schematic diagram somewhere?

RICO is still around, although we have branched into making manufacturing test equipment and our vario business has been virtually non-existent for the last ten years, both new sales and repairs. The electrical schematics were never published, but the block diagrams, pneumatic diagrams and the connector wiring diagrams are shown in the manuals.
Repairs are available, and if the unit is sent in, it will be evaluated. The results will be forwarded to the sender in order to determine whether to perform repairs. Reply to me privately for details.

Michael Newgard, 50