the other of
which was a core memory sense amplifier.
That brings up a good question, where do you find them to repair core memory
boards? I have no core memory, but suspect a important question?
At least one core sense amplifier was listed in the TI interface databook
until relatively recently (10 years ago or so). Which suggests it had
other uses and may not be that hard to find.
I suppose they can fail, but it's not a part I've ever had problems with.
-tony