I have a HP201C oscillator, which mostly works. But, on the one freq range that
I need (x1), the output dies after a short period. This sometimes takes just
seconds, sometimes a few minutes. Other freq ranges are OK. A couple of
questions:

1. Is there some "all you've gotta do ..." fix for this problem?

2. How do you open the case up?

I have a schematic.

TIA,
George