Hello! I have the same problem with my Sub. The circuit-board is burned and the heatsink become very warm and there is light hum in the woofer -speaker. R3 is burned. Yesterday, the sound at idle(no music at the input) suddenly start to 'wobling'(sounds like; flop-flop-flop) and I had to disconnect the unit. I'd like to repair it an wonder if you have found any electrical schematic that can halp me(us)? By the way; the two capasitors C20 og C21 connected from the two rectifier input terminals to ground, which you have discussed, are not defective on my circuit-board and they have the marking: 471 1KV (470pF and 1000volt). Best regards Ketil Walaker Norway meskem@online.no

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