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

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Old 22nd May 2024, 9:18 pm   #1
kirstyd
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Default Grundig Concert Boy 1100.

The dial cord has snapped on this set. I have just downloaded the service sheet hoping to see a diagram on how to restring but there isn't one. Can anyone help please?
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Old 22nd May 2024, 10:43 pm   #2
Andrewausfa
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Default Re: Grundig Concert Boy 1100.

Hi, It's on the last page of the official Grundig manual.

Andrew
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Old 22nd May 2024, 10:50 pm   #3
60 oldjohn
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Default Re: Grundig Concert Boy 1100.

Is the tuning cap free? They are usually seized with dried grease and if the tuning control is forced something breaks.

John.
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Old 23rd May 2024, 8:03 pm   #4
kirstyd
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Default Re: Grundig Concert Boy 1100.

the tuning cap was seized but with some gentle heat and lubrication it is now moving freely .The cord has snapped and i haven't a clue how to restring it so i downloaded the service sheet hoping to find it there but no luck
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Old 23rd May 2024, 8:22 pm   #5
kirstyd
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Default Re: Grundig Concert Boy 1100.

got it now guys .It looks reasonably straight forward .Thanks guys for the help
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Old 23rd May 2024, 8:39 pm   #6
Leon Crampin
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Default Re: Grundig Concert Boy 1100.

Good to hear you've fixed the drive. The seized gang shaft is a well known problem - thin oil is good, once it's freed.

A design fault with these sets is that the main smoothing capacitor is rated only at 16V, which is exceeded when the set is operated on a 230 + 10% supply. It would have been marginal at the design input of 220V. On UK mains, these capacitors end up as a dead short and blow the 400 mA fuse.

Replacement is easy with a 25V capacitor of the same value (much smaller now) but remember that the 3 negative connecting points of the original capacitor need to be wired together on the board to maintain circuit integrity.

Otherwise, very good sets if you can keep the switchgear clean on all wavebands. As a VHF only set, no problems.

Leon.
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