This is only a drawing showing how to make a Variable Capacitor using
Tubing/Cylinders

Dave

 

Good.

Next is, two (connected to each other) concentric pipes going into another two (connected to each other) concentric pipes. Shorter but wider.

Next, tightly twisted (isolated) wire. Space wise, the thinest the better. Seen in the filter part (pF range) of a signal generator.

 

This is only a drawing showing how to make a Variable Capacitor using
Tubing/Cylinders

Dave

A lot of companies make small ones. Google "piston capacitor" or "tubular trimmer capacitor".

 

Hello,

Philips used to make "toltrimmers".
They where made of cilindrical busches that would fit into eachother.
Here is a picture of how they looked like:

Bertus

 

Look great do they make the cap new.

Dave