Anyone have any idea where the following Air Ministry units are used: PSU Type 529 and Type 319 The 529 is a transformer unit, 80v 1khz i/p, 3kv out the 319 is a rotary, 12v in, unknown out. The 529 sounds like a supply unit for an indicator of some sort, Gee, H2S= ? etc thanks. Ben. G4BXD