DIYbanter - View Single Post - fewer through-hole transistors available

Jon Elson[_3_]

wrote:

Jon,

You have spoken of generic issues and some specs for a replacement. What
was the original part number? Perhaps there are existing substitutions
available.

Dan
The part on the board was a Fairchild FMT1190. The part on the schematic
was an A430, which I can't even find a datasheet for.

I patched in an MPSH10, which has a different pinout, but twisted the leads
around to make it fit, and it seems to work well (so far). I'm kind of
worried as 3 out of 3 transistors in the same location of the circuit have
failed. This board was built about 1979, so the replacement might just
outlive me. The complementary transistor in the differential common-emitter
pair (same transistor type) are all fine. I've looked for an obvious
circuit goof, and can't really find anything.

Jon