Jon Soderberg at VintageAmpRepair DOT net is the guru. Check with him. He rebuilt my Forte 5 and 40 pre. He uses great parts--Nichicon, Black Gate, etc.
I agree with both posters, it is a classic, so I wouldn't perform any circuit modifications. If you want to upgrade perfomance you can certainly rebuild it with better caps, wires, reisitors, binding posts, RCA jacks, etc.
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