"Highland Ham" wrote in message
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The Toko inductor with adjustable core is a canned component frequently
used by homebrewers and still available . It comes in 3 model for various
frequency ranges. In Europe (and that includes Britain ) it is
particularly popular by the QRP community.

Frank GM0CSZ / KN6WH

I'd avoid using any "canned" Toko style inductors with adjustable cores.
The most stable coil designs don't use adjustable cores, which are
an invitation to thermal instabilities. Especially ferrites or the types
with cups.

Pete k1zjh