I only brought up the "big caps" problem because it's a common prejudice among DIY folks, along with "transformers are bad," or "pentodes are bad" or whatever. I only agree with part of one of these: electrolytics sound bad in a power supply and the sound horrible in the direct signal chain. And the PS is almost always in the signal chain.

I use a lot of motor run caps, too, and I think they sound great with a good healthy signal. In a wimpy RC circuit (say 12ax7 or 6SL7 @ 1 or 2 m.a.) not so good.

Craft