Total posts : 45366
by MRAM 1500 kHz
Here is a nifty project from 1935 where you scratch make everything but the tube. You make the tuning cap, fixed cap, coils even the resistors. I really like the tuning cap. It would look great in a homebrew crystal radio.
If you wanted to make this receiver, you could probably substitue some other tube available or perhaps use a JFET transistor with the appropriate voltages.
Anyway, here is the link for the one tube regen. And if you decide not to go tube, use the same techniques to homebrew the other parts for a nice back to basics radio.