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Jon Elson Jon Elson is offline
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Default fewer through-hole transistors available

Dave Platt wrote:


Thinking about it... I wonder whether those poor old transistors might
not just have been Plumb Tuckered Out?

Yes, that is another possibility I considered. If the module had been in
use for a long time, with no cooling, these are the highest power
dissipation of all the signal transistors in the unit. Always on at 23 mA.

I repaired an HP synthesizer that had about 400 Germanium transistors in it,
and about a dozen had failed. I replaced them with Silicon transistors and
then sold it on eBay before any more units went out.

Jon