Threshold 4000 "polarity"

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(sorry for my english)
I have two simply questions:
1) Was it inverting or not-inverting? (I haven't owner's manual)
2) I think it's time to replace the four original big capacitors: what is the minimum possible value for each ? ( numbers are illegible)
Thanks advanced for your time

P.S.: after 25 years( or more?) the amp is "perfect".
 
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