The properties of the “HF Litze” (high frequency stranded wire) are indeed better than the CuL version – but this wasn’t used in the Lectron world. I think that is was easier to produce and for less money to order.
Here is a photo of several versions with CuL (1…3 left) and 2 homebrew versions made with “litze” to the right, which can be ordered still today – from time to time – see samples below:
Why not make the coils with this material – if available – by yourself? Helpful is a L/C/R-Meter to check the µH values. As a rough thumb rule: ~ 120 turns for the vari-cap, 10 turns for the coupling coil. All turns on a – moveable – cardboard tube for better adjustment.
Best,
G.
- This reply was modified 4 years, 5 months ago by Guenther.