I bought the KA-7100/KT-7300 new in the 70's. First off, they built like tanks and I never had any sort of problem w/them. Numbers mean very little to me. It's how they sound w/the rest of your gear. I wouldn't worry about the capacitors if its sounding fine. (Now if you handy w/soldiering and you want to change out the capacitors that would be fine but I would not drop too much $ into these pieces. I personally would change out the speaker bidding posts to either: vampire BP-Hex's or Superior Electric BP-30's. Both are great upgrades. IMO. the Superior Electric sound slightly better but they accept only 14ga. or smaller bare wire. Overall not bad sounding pieces if you have the space!
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