Should I buy a new amplifier; and if so, what?

Classe?

The Levinson 336 is a 10k amp. The reason Levinson repair center charges 3000 dollars is brutal. This is how they make a huge profit. The 336 when the caps explode it will take out the 3 surge resistors on the slow start circuit. you can replace those wires very cheap. These surge resistors are there to protect the amp in case there's a short or capacitor fail. No other high end amps have this cap problem. The reason they used philips caps made in China. They used these caps on 331/332/333/334/335/336 and Levinson 33h. These caps need to be changed on these amps. You can replace these caps for 800 dollars on 336. These caps are very hard to find. I have purchased caps for all these amps from factory. Very expensive. Because no one uses this high voltage for filter supply.

The problem is..older amps use large single caps for plus and minus rail voltages. They take up a lot of space as well. Newer amps use many small caps in parallel to make up the large capacitance. The advantage besides size requirements is, small caps have less ESR (equivalent series resistance). This allows the smaller caps to rapidly deliver their current under transient conditions and recover quicker, which in turn makes the amp sound 'fast'. This is especially true in the bottom end i.e. slam.

Hifigeek1

With all due respect, I find your assessment surprising. Cornell dubilier 51000uF/160V replacemet cap for 336 ESR 6.9 mOhms. Using a 10000uf cap ESR 31 mOhms you need 5 caps. It will not fit in Levinson. ESR is lot lower on big caps also ripple current is three times higher. There is a reason Levinson used these Super caps it will give better bass also. Philips caps is the culprit. Replace the caps on Levinson 336 with Cornell dubilier caps or Tech cap 62000uF/125V. The Cornell Dubilier is the worlds best capacitor reason they uses a three stage process to create worlds lowest leakage current, longest shelf life. Also they are made in USA. They have no factory in CHINA. You can watch the youtube on google and see how caps are made. Also Nichicon capacitors are very good for power supply.

The Newer amps uses many small caps to reach large capacitance because it is lot less expensive than big caps. That is the reason.

Bel Canto recently replaced a bad input board on a $3000 amp for well under $200. I would recommend them based good service alone but the product sounds top notch as well.