Quote:
Originally Posted by freakaftr8
we found some bad caps in the filter section.. Going to replace all caps. Also some wax caps in the Demod section have no ESR, going to replace those too
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You can just about guarantee that all electrolytic and paper caps in a forty or fifty year old set will be bad. If they haven't failed yet, they will soon.
It's hard to resist the temptation to power up a set immediately, but it's more prudent to replace the filter electrolytics first. Powering up on a variac offers no real protection against burning up an expensive power transformer. Yes, I have done that, and it cured me of the temptation forever.
Some old electrolytics may "reform" after a fashion, but they are not reliable to use for the long haul, in my experience.
It's also a good idea to carefully clean the HV section, as nasadowsk suggested. HV can do funny things, especially in a set where HV components are coated with carbonized cooking grease & tobacco residue. I would do this even if you are not currently experiencing Bad Things from that section.
I have a CTC-11 on the workbench and a copy of the Sams. If you send me an email by going to
http://antiqueradio.org/contact.htm , we can figure out how to get you a copy.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html