help on changing capacitors

Check HiFi Collective, UK based, they seem to have some stock of Jensen.

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Michael Percy is the go-to guy for capacitors. His website isn’t slick. But, he supplies the best engineers in high-end audio. https://www.percyaudio.com/

Right. Caps are easily swapped. Think of it not as a repair but as an upgrade. Shop for your caps the same way you would shop for any other component- by listener impressions. If you want a silkier more liquid sound, buy those caps and that is what you will have. Do this and you needn't worry about maybe making it sound worse. Almost certainly the caps used were so cheap anything will sound better. Only question, by how much. Oh, and use a solder sucker to get that old solder out of there and use Cardas Quad Eutetic.

Miflex. Clear, dynamic and a little bit bright and should fit in the space.

Can you buy those capacitors from BAT?