Is there a list of what you get? I don't see any resistors, diodes, or transistors in there? Maybe there is but need a list to confirm. Part of the issue with these amps is the capacitor degradation, but just as important is the BJT's that also cause issues, such as random popping, sizzling and various other issues. I do not agree with the choice of some of the caps. The Nichicon FG (Fine Gold) are not what I would choose for power supply applications, especially where they have you fit two radial caps in place of the axial caps, thats just bad workmanship and poor cap choice. There are so many parts of this amp which run so hot, and to slip some 85˚C Audio Grade caps in those places is not a good choice in my opinion. They should be supplying Nichicon VX Axial caps in that instance, which are 85˚C rated, but those caps are not in a toasty area. Nichicon PW Radial for the rest of the power supply. Then depending on personal preference you can use for audio path. Nichicon KZ Nichicon KT (My preference) Nichicon FG and for low value you could use WIMA MKS film caps Oh, and I only see one relay there too, I always replace the soft start relays as they get a hard time through their life. So there should be two relays. I assume the one they supply is the speaker relay. This is the path taken here in this forum, and there are countless SX1250 threads to follow along and make good choices from. What I would do is when that kit turns up, make a list here of what you've got and we can help you add a few more items to it so you're on the right track to make your SX1250 reliable for years to come.