The Twinplex Regenerative Receiver has taught me a lot. It is amazing to think about all the experimentation that went on years ago to get to where we are today in radio.
I wound a coil for the upper part of the AM band. 87 or so turns to start, then removing 3 at a time until I hit where I wanted. I ended up with 76 to 16 (tickler) and may still take a few off the tickler coil to find the effect there. It is kind of narrow banded I think 920 to 1380.
A side view Of the Twinplex with the AM (lower end) coil.
Front view of the Twinplex with the knob indicator and control plates I made for it. My wife says I should find copper screws or rivets to match.
A special thanks to my mentor on this project.