Wish to upgrade phono preamp caps and other


Looking at my PS Audio GCPH I see 4 12000uf NCD caps sitting in what I believe to be the signal chain.

I wish to upgrade to best possible caps in that location.

I'm finding it difficult to locate any 12000uf caps let alone some really good ones that will fit in about a 35mm wide X 45mm high location.

I understood there are companies that replace these caps with Muse but Muse doesn't make that value cap.

I'm not electronic savvy but shouldn't you replace with same value cap?
128x128desalvo55
I doubt that I'll find a schematic on this phono preamp. I know the risks involved, that's why I asked the question.

I don't wish to change the circuit, just perform some upgrades such as caps, fuse, some resonance material, maybe upgrade some wiring.

That being said I should leave well enough alone, I rarely do ;)
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Yes the 12000uf caps are for the power supply. Probably shouldn't touch those. The remaining 4 100uf 6.3volt caps are in the signal chain. Those I'll "touch".
Thanks for your help.
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My old eyes aren't what they used to be. Now I'll have to open her up and recheck but I'm 90% sure they were 100uf. How can one tell the difference between electrolytic and film?