Upgrading Lm3886 Board Caps

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Hi i have built some of Brians Lm3886 based amps and think they sound superb. Very happy in general, however as always i was wondering about a few upgrades.

I have come by some panasnoic purism caps 4.7uf 50v which i was thinking about replacing the input caps with. Has anyone used Purism caps and if so would they be an upgrade from the standard FC in there.

Also i have bought some Elna Duorex II 100uf 50v which i was thinking about sticking in in place of the standard FC caps on the amp boards. I imagine this would help but how much can i expect from these types of upgrades?

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