[quote author="WJS"]the 470nf if i remember correctly is the right cap to use there. this value will have a small effect on the tone of the preamp
very small, you could use almost any small cap... (well not any)
also, that is a neat method for the face plate. I'll have to figure it out and try it some time.[/quote]
470nf in place of the 220nf you mean?