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Film caps can have measurably lower distortion than electrolytics in some applications, there's a series of articles by Cyril Bateman that provide interesting reading. Generally I'd err on the side of oversizing input coupling caps, as the source impedance is something that's beyond my control -...

Well, I don't think the output stage is a BUF634, as they only have one amplifier per package, so there'd need to be two of them for a stereo application. (Strictly speaking, I wouldn't call the BUF634 an 'op-amp', as the gain is fixed at unity - you'll note it's typically used inside the NFB...