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Cambron Console Speaker
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Return to top of page · Post #: 1 · Written at 4:14:23 PM on 24 May 2016.
	JamieLee Location: Clare, SA Member since 27 March 2016 Member #: 1894 Postcount: 513
Hello, I'm wondering if anybody can help me here? Recently I won an ebay auction for a 1930's Cambron Console radio, unfortunately during transportation, the speaker fell out of the console, into the pallet it was standing on and was then speared by one of the forklift tynes, bending it out of shape and destroying the cone. I was wondering if I make my best attempt to hammer and straighten it out, is it repairable, does anybody still re-cone these speakers? It is a bit of a mess at this moment!

Return to top of page · Post #: 2 · Written at 5:35:16 PM on 24 May 2016.
	Pa Man Location: Golden Grove, SA Member since 10 April 2015 Member #: 1726 Postcount: 149
Hi, Have sent you an Email. Josh

Return to top of page · Post #: 3 · Written at 9:27:47 PM on 25 May 2016.
	Brad Administrator Location: Naremburn, NSW Member since 15 November 2005 Member #: 1 Postcount: 7490
It should hammer out without the frame cracking however it will be a tall order to align the frame correctly with the magnet. The outer ring where the cone is secured must be exactly perpendicular to the core of the magnet or the former that the voice coil is wound on to will not travel correctly and will 'pole' on the magnet. Going by photo three, the speaker transformer appears untouched, so that is a good start. So if you are good at panel beating and the voice coil is intact then a re-cone should be possible. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ A valve a day keeps the transistor away...

Return to top of page · Post #: 4 · Written at 9:33:34 PM on 25 May 2016.
	Robbbert Location: Hill Top, NSW Member since 18 September 2015 Member #: 1801 Postcount: 2150
Wow, they really trashed that poor speaker.

Return to top of page · Post #: 5 · Written at 10:59:28 PM on 25 May 2016.
	JamieLee Location: Clare, SA Member since 27 March 2016 Member #: 1894 Postcount: 513
Yep, it's a wee bit crook... Hopefully I might find a replacement, if the impedances are the same, otherwise will have to give it my best shot!

Return to top of page · Post #: 6 · Written at 11:18:38 PM on 25 May 2016.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5523
Definitely remove the field bobbin, voice coil & spider with whats left of the cone & transformer now. One temporary option, seeing that it is a console, is to put a ferrous plate across the face of the field coil & use it off chassis and then use a permanent magnet speaker. Marc

Return to top of page · Post #: 7 · Written at 11:24:37 PM on 25 May 2016.
	JamieLee Location: Clare, SA Member since 27 March 2016 Member #: 1894 Postcount: 513
Do you mean, after removing the bent old cone, wire a permanent magnet speaker to the voice coil wires, once the voice coil is removed? with a plate covering the area across the front of the magnet where the original voice coil was? Just trying to picture exactly what you mean.

Return to top of page · Post #: 8 · Written at 11:42:16 PM on 25 May 2016.
	Brad Administrator Location: Naremburn, NSW Member since 15 November 2005 Member #: 1 Postcount: 7490
The field coil in most radios doubles as a mains filter so if replacing the speaker with a permanent magnet type you need to still keep the field coil in circuit. It needs a metal plate across the poles of the magnet (the pressed metal to support the cone currently occupies this role) to stop the coil having a meltdown. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ A valve a day keeps the transistor away...

Return to top of page · Post #: 9 · Written at 11:55:14 PM on 25 May 2016.
	JamieLee Location: Clare, SA Member since 27 March 2016 Member #: 1894 Postcount: 513
Ok, thank you, understood

Return to top of page · Post #: 10 · Written at 8:58:12 AM on 26 May 2016.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6844
put a ferrous plate across the face of the field coil & use it off chassis and then use a permanent magnet speaker. Seconded!

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