I am currently in the process of making a very retro analog synthesiser from a set of plans I got from a 1970 hobby electronics book.
The plan uses no ICs but has some obscure parts, but I think they are replaceable.
The plan calls for paper capacitors, but I couldn't find any lying around in my electronics stuff, so I am using tantalum and oil capacitors instead, would these work fine? They are the right voltage rating and everything.
The other obscure thing in the plans is the values of the capacitors. The ones that I can't find that it calls for are: 0.5uf, 50uf, 0.25uf, 0.12uf, and maybe a 4uf, but I think I may have one. Do any of you think that it would be acceptable to use the nearest substitute? e.g. 0.47uf, 0.22uf, 0.1uf.
If any of you want to look at the plans, I'll post them up for you.
A build diary will go up as soon as I actually get all the parts together. Once I've finished I plan to amend the plans and release a modern version.