Bob,
They should have the standard "D" set (50.0, 50.2, 50.4, 50.6, 50.8, 51.0) in them I have one TNM Battery Adapter unit (BA-289/U, one home made battery adapter (uses 15 9V batteries, not the 10 of the TNM unit), and the 6V power supply unit from Italy. They have not been used in over 20...