August 31st 2025: Increased tolerances.

This is a coil form for a ferrite loopstick with a diameter of 6.4mm. I am using it for a Superex 7" Loopstick as a part of my CK722 radio project (the first project in the Raytheon Transistor Applications "Build This Transistor Receiver" by Robert K. Dixon.) It serves at the coil form for the antenna winding and the additional 50 turns to the detector stage mentioned in the article. I will also be scaling the length to 5mm to create the 8 turns of the link (antenna) coil.

Here are the dimensions:

ID: 6.85mm
OD: 7.55mm
Thickness: 0.35mm (the same thickness as the original cardboard coil form)
Length: 35mm