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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 27th Nov 2023, 2:27 pm   #1
DrStrangelove
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Default Stuck core in a permeability tuner

A much neglected HMV Radiomobile 4220 tuner has a stuck core.

The tuning mechanism shifts the other cores, but one simply moves the core & the coil itself.

Is there a method of releasing said core?

The thing works ok on MW but it seems to be the LW oscillator core that is stuck.
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Old 27th Nov 2023, 7:43 pm   #2
Radio Tech
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Default Re: Stuck core in a permeability tuner

Try using some WD40 spray that should shift the stuck core but when you try to move it do so extremely gently or you may find the core parting company from the rod that lifts it.

Ken
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Old 28th Nov 2023, 1:37 am   #3
Silicon
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Default Re: Stuck core in a permeability tuner

It might be safer to use some Isopropyl alcohol instead of the WD40.

The mineral oil in WD40 might react with the plastic of the coil former and make it expand.
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