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Sound Technology 1700B

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  Sound Technology 1700B Trevor Wilson <trevor@rageaudio.com.au> - 2022-01-03 12:09 +1100

#9854 — Sound Technology 1700B

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'm 68 years old and 
I've never deliberately used carbon composition resistors. Crazy.
* I was going to replace the critical 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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