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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 (as suggested many years ago by John Curl), available option. Any other suggestions?
* Replace all the opto couplers.
I welcome any input.
Trevor
Follow Ups:
Trevor,
Suggest you look at the "equipment and Tools" thread on DIYAudio.com
Lots of discussions there on audio test equipment; distortion analyser repair; etc. Also try doing a search 1700 search there. Of nothing, ask your question there
Charles
Trevor,
My suggestions are;
Yes, replace electrolytics. I have the ST 1500. It went bad - new lytics on the boards fixed the problem. Regarding carbon comp - would replace them if out of spec - replace all of them?? - how many are there. I wouldn't try replacing the optocoupler's unless you know they are bad - and can you even get replacements today?
Charles
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