Well, it's been a few years. My 1700B has decided to cease operation, so
it really is time for a repair and full rebuild. Here's what I am planning:

* Replace all electrolytic caps in the unit. One of the main filter caps
is dead, so it's time to do the lot.
* Replace all the carbon composition resistors. A quick check on half a
dozen has shown a 15 ~ 25% upward drift. Why did ST use CC resistors?
I've been using cracked carbon since the 1960s.
* I was going to replace the OP amps with LME49710 OP amps, but, well,
you know. NLA. AD797s look like the best, available option. Any other suggestions?
* Replace all the opto couplers.

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