Thanks to all who responded. I have learned a lot.
It looks like the oven is still cycling and changing by about 10 Hz. I
thought I had it licked when it was stable for several hours last night,
but by this morning it was up to its old tricks.
I am going to go ahead and pass along the unit to a friend. Thanks to
all the help I got here, I am going to recommend that he replace the
OXCO with something more modern. It looks like a $25 Morion from ebay
will do the trick and the Cushman will probably do what he needs it for
with this upgrade. Since they are cheap, I might even shotgun most of
the remaining electrolytic capacitors in the main supply before I give
it to him, as well as replace the resistors that are well beyond tolerance.
The one nice thing about the Cushman 5110 is that it uses enough common
discrete components to be quite repairable and most of them seem to
still be available.
Thanks again to all who helped.
Fred Bray
KE6CD
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