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My opinon is to replace all resistors and caps (precision & otherwise) if restoring one of these testers. The "precision" Solar caps were drifted so far out of spec it was a no-brainer. I think I spent about $30.00 worth of replacements for my CB-1-60 including the 2mm test jacks from Mouser (all 1% or better stuff) and it's kind of scary how accurate this old ~~ 1940 year instrument is with the simple yet elegant Wien bridge design.
Tom (PK)
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