Smoothing capacitor replacement

Hi,
I need to replace my smoothing capacitors in my guitar amp - they're
5000uf 50v. I tried some 4700uf 63v ones but they blew up!! I couldn't
tell the polarity of the original ones - they just had a pink dot on
one of the terminals, which I assumed was negative, so wired the new
ones accordingly. Did they blow because of the incorrect polarity or
are they the wrong rating? If they are the wrong rating, can anyone
point in the direction of the correct replacements (maplin order code
or something??)

Cheers in advance for the help!!

.

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