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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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28th Mar 2023, 7:08 pm | #21 | |
Triode
Join Date: Mar 2023
Location: London, UK.
Posts: 17
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
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What were they thinking!!!!!!! |
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28th Mar 2023, 11:45 pm | #22 |
Octode
Join Date: Feb 2007
Location: Harrow, London, UK.
Posts: 1,483
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Don't be too critical of German engineering.
Their radiograms and radios were sold worldwide and in keeping with best practice, fixing screws and nuts would cause major problems if they became loose, hence the locking paint. Open up many new domestic electrical units and you will find hot glue is also used to secure heavy parts, such as speakers and large components to ensure safe transit from the place of manufacture to the end user. Looking at the restoration of the Grundig KS series, a socket set with an extension bar is seen. A nuisance maybe, but not a cause for a formal complaint. I'm reading your post with interest so good luck. Chris |
29th Mar 2023, 9:26 am | #23 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,731
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
The 2nd picture appears to still show a bolt from the cabinet underside into the chassis. Is your problem that you cannot remove the bolts due to the 'gunk' or that the chassis is somehow stuck to the cabinet? Most German sets used 4 bolts from underside into the chassis.
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29th Mar 2023, 12:49 pm | #24 | |
Triode
Join Date: Mar 2023
Location: London, UK.
Posts: 17
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Quote:
I can get a flathead screwdriver underneath the gaps between these bolts and washers, but I can't get enough purchase under the chassis to lift it off the bolts. Not sure what else to do. I know that if I could get the chassis off and out, I would be able to see what damage I've done to it and try to effect a repair. Until then..... |
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29th Mar 2023, 12:52 pm | #25 | |
Triode
Join Date: Mar 2023
Location: London, UK.
Posts: 17
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Quote:
I didn't think Grundig did this as when watching various YouTube videos of people removing the chassis, it was hard but not impossible. The glue seems extremely good. I assumed that someone else had restored it and glued it back for reasons unknown. My assumptions could be wrong! |
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29th Mar 2023, 1:14 pm | #26 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,315
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Grundig radios that I have serviced usually have a thick hard rubber washer between the chassis and woodwork. They are often hard to remove and maybe stuck to the wood to keep them in place when refitting the chassis.
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29th Mar 2023, 1:27 pm | #27 | |
Triode
Join Date: Mar 2023
Location: London, UK.
Posts: 17
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Quote:
Just been at the bolts with a soldering iron and nothing has happened!! |
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29th Mar 2023, 1:36 pm | #28 |
Moderator
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Thread retaining compounds are designed to stop threads vibrating loose and it's generally fairly easy to undo them. It helps if you tighten the screw to start with and then repeatedly screw it in and out by a small amount.
Perhaps the washers are rubber which has perished and become sticky? Can you not bend up an 'L' shaped lever, a cycle tyre lever might do, and use this to lever the chassis away from the cabinet? Are the fixing screws fitted to tapped (threaded) holes in the chassis or did they have nuts on them?
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29th Mar 2023, 1:49 pm | #29 | |
Triode
Join Date: Mar 2023
Location: London, UK.
Posts: 17
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
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29th Mar 2023, 1:59 pm | #30 |
Moderator
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Sorry, but you've lost me.
If the screw threads are in plain, rather then threaded, holes in the metal chassis and any nuts have been removed it should be possible to lever the chassis out. If the holes in the chassis are threaded and the screws have no heads I've no idea how you'd get them out. I can certainly see one screw with a slot in your pictures. EDIT. You could try locking two nuts together on the thread and then screwing it in.
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29th Mar 2023, 2:45 pm | #31 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
The chassis looks to be tapped where those screws/bolts come through, the blue stuff is probably the manufactures thread locking compound.
Mods. permitting, a completed listing for clarification only: https://www.ebay.ie/itm/185803338471...Bk9SR9r3mdnlYQ Lawrence. |
29th Mar 2023, 2:56 pm | #32 |
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
That appears to have threaded bosses in the chassis which is what I would expect.
I'm still mystified by the headless screws though.
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29th Mar 2023, 4:53 pm | #33 |
Heptode
Join Date: Jan 2011
Location: Croydon, London, UK.
Posts: 767
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Looking at your photos, the chassis seems to be a long way back from the front of the cabinet. Does the panel that the chassis is mounted on come out of the cabinet (after removing some woodscrews), complete with the chassis to reveal the screw heads of the chassis mounting screws?
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29th Mar 2023, 5:40 pm | #34 |
Octode
Join Date: Aug 2003
Location: Welwyn Garden City, Herts. UK.
Posts: 1,906
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
In post 10, picture. To the right of the snap is clearly a screw to undo, so possibly another to the left out of shot. Not cross headed screws but flat head.
Removing these whilst holding the chassis would no doubt release same. You will need to look to see how the other edge is secured. |
29th Mar 2023, 7:55 pm | #35 |
Octode
Join Date: Feb 2007
Location: Harrow, London, UK.
Posts: 1,483
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Although there is a YouTube video of the repair of the KS550, it isn't nearly as good as the Grundig Majestic which includes simple hints on keeping screws, cables and that for ease of disassembly and reassembly, place the unit face down so the weight of the chassis doesn't break the dial.
Anyway, enough of me, have a look at "1959 Grundig Majestic SO141Ua" on YouTube and I hope that it will answer some of your initial problems. The video also includes dealing with noisy controls and replacing those important capacitors. I'm sure that after watching the 3 videos and BVWS Members support you will soon have this very nice radiogram back working as intended. Chris |
31st Mar 2023, 6:53 pm | #36 |
Triode
Join Date: Mar 2023
Location: London, UK.
Posts: 17
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Hi all,
Sorry for the delay in getting back to you all (was having a mental health break from the internet!) Having let all your comments whirl around my mind for a while, I eventually realised that there were indeed a couple of screws holding the front panel on (found by the record player and the tape player drawers. I unscrewed them and voila, the panel folds down to reveal the screws that one of you was talking about. I unscrewed them and now the chassis is all but out. Just have to unsolder the speaker connections (making sure to photograph them first!) and I should be able to put it on a bench for further examination. My next question is what would be likely candidates for components that I've ******** up with contact cleaner? Answers on a postcard boys and girls!!! |
31st Mar 2023, 7:07 pm | #37 |
Octode
Join Date: Sep 2017
Location: Bristol, UK.
Posts: 1,642
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Have you actually tried it since it stopped working after the contact cleaner? I've often had things stop working after spraying, but normally they revive once the liquid cleaner has had time to evaporate.
Mike |
1st Apr 2023, 4:12 pm | #38 | |
Triode
Join Date: Mar 2023
Location: London, UK.
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
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The issue that I've introduced by my own naivete is that since I sprayed the cleaner into the pots, the sound has become somewhat awful. To give you an idea, I took a video https://www.facebook.com/537842564/v...03314004877536 (Apologies for linking to FAcebook!!) I did leave it for a day after spraying to fire it back up. Done so a number of times now and still the same! The issue is that the sound just breaks up. Not intermittently, it is like a sound effect (I mentioned dalek earlier). If you have any ideas, do let me know! |
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1st Apr 2023, 6:16 pm | #39 |
Hexode
Join Date: May 2006
Location: Cambridge, Cambs. UK.
Posts: 469
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Sounds as though maybe the signal from your Echo dot or whatever is too large for the input of this grundig amplifier. Have you tried it on its own radio and record player?
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2nd Apr 2023, 10:40 am | #40 | |
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Re: Help with a Grundig KS550 that I've managed to ruin the sound of :(
Quote:
Now that you have access to the pots it would be a good idea to spray contact cleaner into them as it's not likely to do any harm. There's generally space around the solder tags where you can spray the cleaner into.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
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