It used to be so easy to go to Canal street and buy radio parts. Now even simple things like open air coils are hard to find.

I wanted to make a Vacuum tube transmitter but couldn’t find a decent coil in the parts bin. I’ll just have to print the form.

After winding it I had to find a matching Capacitor.

A quick trip to the parts bin yielded all the other necessary pieces.

See the full build details here:

http://www.instructables.com/id/40M-QRP-Transmitter-Using-A-6CU6-Tube/

 

3D Coil Forms for Ham Radio