I am trying to attach a PDF file of a few salient pages from the manual to see if this helps find the parts you need.
Handwritten on the front of the manual is "1968 AF-520A" which I surmise represents the straight Nav-o-matic 400 model this manual is for. You will see the Amplifier is "CA-520A", the number you have on your amplifier.
Hopefully, if I am successful, there is a PDF file attached to my post.
Last edited by wslade2 : 01-25-21 at 07:38 PM.
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