On Sat, 8 Nov 2025, Tom Hunter wrote:
I got hold of some MPSH81. Unfortunately they are
not a suitable
substitute
for a 2N3639 or 2N3640.
[...]
It's not too hard to find the plastic versions of the 2N2369, the PN2369.
Mouser has them and so does electronic Goldmine.
Bob
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Vintage computers and electronics