Ya round inductor looking good. Sorry the 47uf cap was not bipolar. It was normal electrolytic capacitor with positive and negative sides. I will try with 10uf cap but what voltage cap to use?Is that round inductor near the cap OK? The windings look dark.
Have you tried installing something like a 10uF film cap in that location to see if the amp worked OK with it?
Did you check the cap to see if it was shorted?
Amp is pulling plenty current.A 100v should be OK unless the amp can drive more than 100v to the speaker terminals.