1974 Brain Box saves the day.

From what I can tell if the transistor is marked Motorola, RCA, or Texas instruments it functions. I have a tester for them and most of the "new" ones fail at high rpm also. I only deal with pre 80 stuff. @Stephen Hotz is working on a fix for these that should not fail at all. He is taking old cases also if you want them to go to a good cause.