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Old 23rd Nov 2023, 12:00 pm   #1
sparkymike
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Default HMV model 100 car radio

Can the vibrator type be checked if it is an original type or is a solid state type by photo below. On output, would voltage be around 12volts AC ?
Mike.
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Old 23rd Nov 2023, 12:19 pm   #2
Station X
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Default Re: HMV model 100 car radio

All the commercially available solid state vibrators I've ever seen have been clearly marked as such on the casing.

Have you unplugged it to see what markings it bears?
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Old 23rd Nov 2023, 12:36 pm   #3
Herald1360
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Default Re: HMV model 100 car radio

The voltage on either output pin of the vibrator (each connects to the end of a centre tapped primary winding on the HT transformer) would be a 12V peak square wave plus whatever spikes and ringing are kicked off when the contacts open. If measured "AC only" this would look like about 6V rms.
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Old 23rd Nov 2023, 1:17 pm   #4
sparkymike
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Default Re: HMV model 100 car radio

Hi Graham, it is not my radio, but a good friend's and am trying to help him diagnose the problems remotely.
Mike
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Old 24th Nov 2023, 10:43 pm   #5
sparkymike
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Default Re: HMV model 100 car radio

My friend has opened up the vibrator and points are dirty and not making continuity.
Is there any way he can clean them without damage.?
Mike.
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Old 25th Nov 2023, 9:30 am   #6
Mr 1936
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Default Re: HMV model 100 car radio

Hi

The best thing to use is a fine grade diamond spatula, these are specifically intended for contact cleaning. Unfortunately, the type I use seem to be no longer made.

You could use fine grade emery paper, but the fine emery particles which break off leave behind a conductive dust which needs to be flushed out with switch cleaner afterwards.
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Old 25th Nov 2023, 10:10 am   #7
Ian Blackbourn
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Default Re: HMV model 100 car radio

I have some brand new vibrators which I know are an exact replacement for the Plessey 1214 used in these car radios.

Please pm me if interested.

Ian
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Old 25th Nov 2023, 10:50 am   #8
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Default Re: HMV model 100 car radio

Before you do anything about the vibrator it is imperative that the two 0.01uf capacitors across the secondary of the vib transformer are renewed. If they fail s/c (and they frequently do !) the vib transformer and the vibrator itself could be damaged.
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Old 25th Nov 2023, 6:23 pm   #9
sparkymike
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Default Re: HMV model 100 car radio

The owner has taken the vibrator cap off and cleaned the points with paper soaked in white vinegar which removed a black residue and now set is working.
It has had many of the caps replaced and previous owner spent £250.00 on full service and then it was left on a shelf for several years.
Mike.
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