Telefunken ELA M 251 Clone Tube Microphone Build Thread (D-Ela M 251E)

[egroys]

Alright. What difference will the 1uf make? Can you possible link to a Mouser material number that could work?
I’ve read somewhere that I should go for Polystyrene & Tantalum capacitors.

You're going to have to source those on eBay, most likely. Search this thread about "coupling" caps and you'll see what folks say.