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

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Old 14th Aug 2017, 1:09 pm   #1
Goldieoldie
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Location: Petersfield, Hampshire, UK.
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Default Goodmans speaker problem

Hi
I have this speaker 5inch from an Ultra Coronation radio
That cone was rubbing so I undid the 3 screws hoping I could realign the cone
Now I can't get the centre screw to take up
Does the bit in the back unscrew or is there another way to repair please ?
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Old 14th Aug 2017, 1:27 pm   #2
crackle
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Default Re: Goodmans speaker problem

There is a chance that you will never get this working again unless you can remove the cone, and that in itself is probably going to be very destructive as well.
It may be possible to cut away the centre cap covering the speech coil, and prise the moveable pole piece back to the centre. But my fear is it will just snap from one side to the other.
Put some very thin strong plastic strips in the gap to stop the pole piece snapping too far to the other side.
But first I think you should replace the 2 outside screws if you can.

What has happened is the centre magnet pole has slipped to the side of the speech coil gap and is stuck fast to the side by magnetic force.

It is only advisable to try and repair speakers that can be totally dismantled.
I find this tends to be ones from before the 1940's.
The electromagnetic speakers are the easiest to repair.
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Old 14th Aug 2017, 4:24 pm   #3
Goldieoldie
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Default Re: Goodmans speaker problem

Hi,
Thanks for your help
I cut the centre of the cone as you suggested with a scapel
It then used a long 4ba bolt to screw into the metal centre then pushing it all the way out
I then used fine wet n dry to clean up the cardboard
The metal centre went into the dremel to take a few thou off !
All back together with evo stick to repair the cone and it works !
Not hi fi but good enough for am
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Old 14th Aug 2017, 4:25 pm   #4
Goldieoldie
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Default Re: Goodmans speaker problem

Finished repair !
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