Two great pulls from the scrap heap

[shaggy]

I don't know what a HP 400 is but capacitors are still capacitors.

Modern capacitors are generally better, smaller, and lower ESR. I might avoid the extremely low ESR caps in some applications.

If you can read the values off the old parts, maybe measure them first to see how bad they are, and identify the weak sisters to replace first.

JR

HP 400 series (400E, 400EL, etc) are really nice wide-bandwidth analog AC voltmeters. I have a bunch. Could buy them for a song at Ham swaps 15-20 years ago.. maybe still can, but with a couple more decades wear and tear.