Parts Connexion still lists a 3.3uF, 50V PK Black Gate on their site(click on Black Gate, bottom of page). (http://www.partsconnexion.com/t/catalog/CapacitorsElectrolytic.html) I wish Sanyo would produce their OS-CONs in higher voltages.
KZ is the "top" Nichicon audio cap, but not available in 3.3uF. I would fall back on the FG or the ES (which is bi or nonpolar). Odyssey Audio uses ES series for their "upgraded parts" amps.
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