I have seen in CRT TVs a permanent magnet core choke used at some point.
It has very little use I'm afraid. It is just an inductor with a 'kink' in its hysteresis curve as the magnet is overpowered. It is designed to work at high current (several Amps) but only at low frequency, less than 20KHz.
The core is of little use but if you can salvage the wire it can be re-used.
Brian.
Yes it is definitely magnetic. I think the magnet is the top glued part. In the past I had other such coils. In one of them the magnet was not glued but held on top with thermal shrink tube. When I removed the tube, the magnet came out. But in this one it is glued.The photo in post #7 seems to show a simple coil with ferrite core. Are you sure that it involves a permanent magnet? Due to the open magnetic path, the core has only limited effect on the coil characteristic.
Thanks, a ferrite permanent magnet glued to the top of the drum core, probably a second one at the bottom. I agree, it can be hardly used for anything besides it's original dedication.
Expect only a small nonlinear effect, surely nothing like a diode.
Magnetic amplifiers are not 'lost technology' but their design doesn't allow for general purpose use so more versatile methods are normally used. You can even amplify audio with a gas flame - obviously rather dangerous but it was widely used to amplify stage productions before tube amplifiers took over!
Brian.
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