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Old 13th Apr 2017, 8:16 am   #1
Dickie
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Default Bush BP10 Loudspeaker cleaning

I knew of their existence, but this is the first time I've had to deal with one of these "inside out" loudspeakers. (or should it be outside-in?). It's 6 1/2" dia. and only 1 3/8" deep.
I must preface this with the fact that it works OK. So anything I do to it needs to be non-invasive. I would like to clean off the rust and corrosion on the frame if possible and prevent it getting worse in the future. The magnet also has some surface corrosion but that is impossible to get at without dismantling things. I need to avoid getting the rust dust ending up glued to the magnet and worse places. I assume the front and rear metalwork sandwich the paper cone and it is all glued together. So dismantling is out of the question. I have thought of wire brushing it with a vacuum cleaner nozzle in close proximity, or maybe coating it with a layer of grease and scraping the rust off into a sticky mess.
Any ideas would be welcome!
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Old 13th Apr 2017, 8:26 am   #2
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Default Re: Bush BP10 Loudspeaker cleaning

Hi Richard

The LS you have doesn't present too much of a problem taking the front of the LS off, from what I can see there aren't any rivets only two screws in the centre, I think if you remove the screws the front will come off and reveal the cone which should make it easy to clean up and re-spray the metal parts.

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Old 13th Apr 2017, 8:43 am   #3
GeoffK
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Default Re: Bush BP10 Loudspeaker cleaning

The screws are to hold the magnet central, the speaker can't be taken apart. The rust should just be stabilised with a gel such as Jelonite, this will avoid any rust dust. The magnet could be reached with a small brush to coat the rust with Jelonite. If necessary the speaker front could be painted silver after masking the holes.
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Old 13th Apr 2017, 8:26 pm   #4
Dickie
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Default Re: Bush BP10 Loudspeaker cleaning

Thanks. Jenolite or similar is an option. I don't want to risk undoing the screws just in case they do happen to be the centralising screws.
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Old 14th Apr 2017, 10:08 am   #5
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Default Re: Bush BP10 Loudspeaker cleaning

Hi,

I've had one of these apart before, it was a lot more rusty than yours though! If I remember correctly the cone is stuck to the front (flat side) with the magnet under it. As yours is working and doesn't look bad, I'd say leave well alone with regards to taking it apart. I'd probably just rub some Briwax or similar into the rust and leave it.

The screws are for the magnet, and should not be touched unless you can re-centre it. To get it apart you have to lever the front away from the back, and they are a tight fit.

These Bush BP10's sound rather good when up and running! I have 2 of them, one near mint that just needed a couple of caps changing, and a 3 basket case one that has more rust than radio!

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Last edited by Lloyd 1985; 14th Apr 2017 at 10:12 am. Reason: Added info about the screws
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Old 14th Apr 2017, 11:11 am   #6
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Default Re: Bush BP10 Loudspeaker cleaning

If you must scrape the rust off, no wire brushes! Use a neodymium magnet close to where you are scraping to collect the metallic dust.
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Old 14th Apr 2017, 12:35 pm   #7
Nickthedentist
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Default Re: Bush BP10 Loudspeaker cleaning

If it works, I'd be very wary of trying to improve its looks and potentially stopping it working. A wipe over with an oily rag would be as far as I would go.
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Old 14th Apr 2017, 7:05 pm   #8
Dickie
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Default Re: Bush BP10 Loudspeaker cleaning

Thanks to all for the advice. I think I shall try and remove some of the flaky bits with tweezers and then "stabilise" it with an oily rag.
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Old 14th Apr 2017, 10:31 pm   #9
Lloyd 1985
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Default Re: Bush BP10 Loudspeaker cleaning

Here's another thought for removing the flaky bits, Blu-tac! Or sticky tape.

Here's some photo's of one of these in bits...

Regards,
Lloyd.
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Old 14th Apr 2017, 10:33 pm   #10
Lloyd 1985
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Default Re: Bush BP10 Loudspeaker cleaning

And a few shots of the repair, which actually looks terrible, but it works!

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Lloyd.
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Old 15th Apr 2017, 7:12 am   #11
Dickie
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Default Re: Bush BP10 Loudspeaker cleaning

That's very impressive. I've done that sort of rebuild on a conventional 'speaker, but not one of these. Makes my job look easy!
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Old 19th Apr 2017, 9:21 am   #12
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Default Re: Bush BP10 Loudspeaker cleaning

The 'speaker is now "done" and re-installed in the cleaned and polished case. I eventually removed all the loose bits with blu-Tac, stabilised the rust with Kurust, and covered all my sins with a coat of aluminium paint.
Whilst I have your attention, can anyone post a picture of an original front Bush Logo for the BP10? I know this has been requested before, but there is nothing currently available I can work with. Like many others mine is missing, and if I am going to replicate it I might as well get it right.
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Old 20th Apr 2017, 7:57 am   #13
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Default Re: Bush BP10 Loudspeaker cleaning

I've never tried to take an inverted cone speaker apart, so full marks to Lloyd 1985 for his restoration job. Besides being used in some Bush radios, they were also used by Radiomobile in their CVO2 (Commercial vehicle installation kit) which was used to house a variety of car radios, plus a 24/12 voltage dropper where needed. Those haven't beeen made now for around 40 years, so there are probably a few in poor condition about somewhere.
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Old 20th Apr 2017, 11:09 am   #14
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Default Re: Bush BP10 Loudspeaker cleaning

As it happens I am in the middle of restoring my BP10 so I have taken a photo of the front panel logo. It's a little scruffy but hope it is what is wanted.

Ian
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Old 20th Apr 2017, 2:32 pm   #15
Dickie
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Default Re: Bush BP10 Loudspeaker cleaning

Thank you, that's great. Do you assume the stripes on the "flowerpot" were originally deep red and black, as per this:

https://www.vintage-radio.com/images...o/bushlogo.jpg
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Old 22nd Apr 2017, 7:46 pm   #16
IanG3XYV
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Default Re: Bush BP10 Loudspeaker cleaning

I'm not sure to be honest. There is no colour on mine between the red stripes of the flowerpot but there is definitely some dark colour on the trunk where it enters the pot.

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