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
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