Hello all - I'm looking at replacing the coupling caps on my ehx 12ay7 preamp - they're blocking approx 100v and the spec is 250v 47uf in a 16mm dia with max height of 18mm - space is pretty tight and there's a different circuit board right above..

circuit here in an article by the designer. They 're in parallel with a 1uf film cap too.

as far as I can tell caps of this spec/size are unobtanium at the moment.. rubycon seem to offer a 16x16 version but it's a long long lead time..

I do think I could *maybe* fit pairs of 22uf 10x16mm - that would give me 44uf, right? is that frowned upon or ok?

(Another possibility is that I *might* be able to drop the lower board by a millimeter or so, perhaps just enough to fit 20mm caps in, in which case the options are more plentiful, but I'll have to check carefully!

You are correct, 22uf and 22uf paralleled will make 44uf, you'll be good, As long as the voltage ratings are up to snuff.

Cheers