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RE: Metallized caps require significant break-in time...

I believe one has to approach cap ratings with caution when the cap is going across the AC line. Depending on mfgr, a cap rated for 600/630VDC may have a very much lower AC line rating. If the cap is designed for across the line use it will almost always carry a specific AC rating and an "X" designation. As I understand it, the problem with AC line ratings is that while the nominal voltage may be 120VAC, there can be multi-KV spikes due to switching of inductive loads and other events. X/Y caps are designed to deal with these events and also have a defined (safe) failure mode.

I'm not aware of any audio grade cap carrying an X or Y rating and so would be inclined to use some form of current limiting during an across-the-line break-in process such as a properly rated fuse or even an incandescent bulb matching line voltage.

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