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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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Thread Tools |
18th Jan 2020, 11:52 pm | #21 |
Octode
Join Date: Nov 2005
Location: Surrey, UK.
Posts: 1,870
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Re: Grundig Concertboy 1100
The 'speaker coupling capacitor is indeed 1000uF 10V.
If you let the smoothing capacitor fail dead short on our 250V (sometimes) mains, the selenium bridge rectifier may be damaged before the 400 mA fuse blows. Leon. |
19th Jan 2020, 9:13 am | #22 |
Tetrode
Join Date: Mar 2018
Location: Amsterdam, Netherlands
Posts: 68
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Re: Grundig Concertboy 1100
Good to hear, that the radio runs again.
Something called 'Desolv-it' seems to be doing just that… Some cleaners might even desolve the plastic itself... |
19th Jan 2020, 10:48 am | #23 | |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
Quote:
Though this year at the rallies I'll be looking out for a woody grille 1100.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
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19th Jan 2020, 10:56 am | #24 | |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
Quote:
As this is a concerning factor to consider when restoring vintage gear, I was doing some searching for a data sheet for this spray. It appears that this is a natural solvent. Photo attached of the can.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
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19th Jan 2020, 12:09 pm | #25 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,936
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Re: Grundig Concertboy 1100
Foaming cleaner can remove some lettering on aluminium or plastic. I once damaged some text on a Technics cassette deck front panel that way. It's easy to get caught out, as most surfaces survive perfectly well.
You may be able to reconstruct the logo by printing it on a waterslide transfer. |
19th Jan 2020, 1:21 pm | #26 |
Octode
Join Date: Nov 2005
Location: Surrey, UK.
Posts: 1,870
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Re: Grundig Concertboy 1100
My black sets all have Se rectifiers, although different types are fitted and the board is drilled for at least 2 pin outs. One black ITT rectifier looks like a Si bridge, but is definitely Se.
If run within limits, Se rectifiers are usually OK, with the notable exception of devices made by AEG. These are definitely change on sight and have caused damage in many cases by their failure. Leon. |
19th Jan 2020, 1:44 pm | #27 | |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
Quote:
Hmmm, I'm going to have to restrict the use of this stuff to just 'casing' where there is no lettering at all. In the meanwhile it might be worth trying to find an alternative cleaner.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
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19th Jan 2020, 2:17 pm | #28 | |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
Quote:
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
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19th Jan 2020, 2:22 pm | #29 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,936
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Re: Grundig Concertboy 1100
That does look like a replacement, though it may be a factory mod introduced late in the production run.
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19th Jan 2020, 3:41 pm | #30 |
Octode
Join Date: Nov 2005
Location: Surrey, UK.
Posts: 1,870
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Re: Grundig Concertboy 1100
Definitely a replacement. The overrun capacitor on UK mains probably destroyed its predecessor. Check that the fuse is correctly rated at 400 mAT (delay).
Leon. |
19th Jan 2020, 4:55 pm | #31 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
I'd better check that out.
I ought to get some contact adhesive tomorrow to put the aluminium strips back on.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
26th Jan 2020, 8:27 pm | #32 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
It's all back together working and sounding great as ever. I haven't twiddled with any alignment. I'll need to get a datasheet and perhaps make some check at some point.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
2nd Feb 2020, 11:56 pm | #33 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: Grundig Concertboy 1100
Well Radio 3 tonight is certainly putting the 1100 through it's paces tonight with a good jazz session.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |