Locating capacitors

Steakster:

I would choose the cap based on operating temp (105C preferred over 85 C), then the lowest ESR (equivalent series resistance), then finally ripple current (highest best). Load life is generaly the life of the capacitor operated at a given set of conditions specified by the manufacturer (like maximum temp of 105C and max ripple current) before it begins exceeding its specs (say for example, leakage current, which may steadily increase as the cap gets older). A 2000 Hr rating will not be as good as a 5000 hr rating, for example.

Parts Connexion. There sharp also, contact them and they can help you out.

It doesn't need to be a Nichicon. There are plenty of good quality cap manufacturers out there. Why don't you call the manufacturer of the tube amp you own and see how much they want for the part.