de N4TGC Eric I have four Motrac units - one each U63MHT-3100B and U73MHT-3100A, and two U63HHT-3100B. They had a 6146* driving a 5894. What sort of p/s are these? There are other numbers on these "antiques" if needed ... *actually a 6146 with 12v fil., which is a different # ...