Help for Threshold Stasis 2

Hi All,

I have a Stasis 2 amp in for repairs and it was mentioned to me that upgrading the large Caps might be in order, my question is what would i replace them with... Capacity, voltage err brands :D The ones currently installed are original.

Would it also be a good idea to use smaller poly caps to filter the large electrolytic and what value would you recommend.

thanks in advance

Alan