From my experience replacing standard electrolytics with Black Gates you will get a cleaner, less bright sound. If you like this amp, it's worth it.
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I have a special amp made by John at Musical Concepts and it sounded great. Then I installed the 10,000 uf FK Blackgates and it was a significant upgrade. The Blackgates gave an ease and naturalness to the sound that was much more anolog like. It sounds very similar to a battery power supply except with more punch and control (which is a weakness of battery power supplies).
I ALSO HAD JOHN @ MUSICAL CONCEPTS INSTALL THE LARGE BLACK GATE CAPS IN ONE OF MY AMPS. ALTHOUGH EXPENSIVE, I THOUGHT IT WAS A SIGNIFICANT UPGRADE.THE SOUND WAS SMOOTHER,FASTER,AND MORE DETAILED EVEN WITH LESS FILTER CAPACITANCE. THE AMP MAY HAVE LOST A LITTLE OUTPUT CAPABILITY BUT THE TRADE OFF WAS WORTH IT.