I don't have schematics for my K3S but going by those for the K3. The KeyOut line (RCA Jack) is driven by a IRF1630 which appears to be out of production. Either than or it is a misprint and is actually a IRF630. If the latter it appears pretty burly. Can I assume it can drive a pair of reed relays without suffering an inductive kick failure? 73 jim ab3cv