I posted these in a different thread also.... ridiculously in expensive, sound pretty good. Worth a try if you haven't done anything.
https://www.ebay.com/itm/Aucharm-Hi-Fi-6-32mm-Audio-Silver-Alloy-Gold-plated-cap-fuse-Slow-blow-0-5A...
https://www.ebay.com/itm/Aucharm-Hi-Fi-6-32mm-Audio-Silver-Alloy-Gold-plated-cap-fuse-Slow-blow-0-5A...