{Collins} HP-23 PSU conversion

OK, OK, I'm monopolising the list.  :o)

I've ordered a TIP-50 and some 90v zeners to make a
275V regulator to add to my HP-23.  Is there any
reason I can't just use the metal frame of the PSU box
as the heatsink.  From what I see, it shouldn't be
more than a 5W load.

Bob - AE6RV
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