20-10-2016, 06:48 PM
The tuning coil is a 47uH RF choke inside an old glass fuse case. It is fixed. The reaction coil is a 100uH RF choke mounted on an acrylic button fitted on the end of a 1/4 inch brass shaft. The feedback capacitor is included behind the button. The 100uH choke and capacitor can be rotated indefinatly, it has no end stops. Connections to the reaction choke are via the metal frame, and a brass slipring. The two bushes are from old potentiometers. The aluminium angle is from a DIY store. The base is 3mm black acrylic This gives a very smooth reaction, and excellent all-round results.
Bob
Bob