help repairing a lowther

jakruby · 22nd May 2011, 10:19 AM

hi there,
i have a lowther PM6A 70s vintage and the wire from the coil to the to the cone (and eventually the speaker terminals) has come loose. if i press with with my finger onto the cone where the wire is attached it works. how do i repair this. i have seen a japanese site where this is discussed but cannot make head or tail of the google translation. apparently this is a commonish problem. does anyone have any info?

digits · 22nd May 2011, 12:12 PM

There are at least 2 speaker repair places in SA. It should be cheaper than you think.
THey charge about R500 for a recoil on a woofer for instance.

simon7000 · 22nd May 2011, 04:13 PM

If the coil is not failing just the lead then this can be re-glued with speaker glue. The loose connection should be soldered. This repair requires some skill so as not to burn the cone or leave too much weight from the repair.

jakruby · 22nd May 2011, 04:40 PM

it is just the lead. i have tried soldering. didnt burn the cone but it would not take - perhaps the aluminum wire? will try with another iron and acid core solder i believe that is what one uses for aluminum. i have also seen a product that is used to repair pcb tracks - a sort of paint that is conductive that seems safer to try. i read somewhere that this is a particular lowther issue so hoping someone would enlighten me if there is a specific way to repair it.
thanks for the reply digits, i dont think a normal speaker repair place could fix a lowther - they have double wound coils, both inside and outside of the former.

simon7000 · 22nd May 2011, 04:47 PM

Don't use acid core solder. It will slowly destroy things. Soldering old aluminum has never worked for me. If you want to try, you have to use a bit of lye dissolved in water to first clean the aluminum and then be sure no solution ever touches the cone and all is cleaned off of every other surface. The use a solder alloy designed for aluminum.

The double voice coil has been used by quite a few folks.

The toughest standards for a recone facility to meet are those of JBL. So look for someplace that is certified by them if you give up.

My cost on a 2 ounce tube of speaker glue is $7.00! It is special stuff, but you should be able to buy some on the internet.

digits · 23rd May 2011, 05:18 PM

Erm these guys actualy can, they can copy stuff down to the micron, and are being used by some local universities...

Loudspeaker Doctor :: Welcome

jakruby · 23rd May 2011, 05:36 PM

my apologies digits! i checked out the site, they even have photos of some lowthers. thanks for the tip.

22nd May 2011, 10:19 AM	#1
jakruby diyAudio Member Join Date: Jun 2007	help repairing a lowther hi there, i have a lowther PM6A 70s vintage and the wire from the coil to the to the cone (and eventually the speaker terminals) has come loose. if i press with with my finger onto the cone where the wire is attached it works. how do i repair this. i have seen a japanese site where this is discussed but cannot make head or tail of the google translation. apparently this is a commonish problem. does anyone have any info?

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22nd May 2011, 12:12 PM	#2
digits diyAudio Member Join Date: Apr 2011	There are at least 2 speaker repair places in SA. It should be cheaper than you think. THey charge about R500 for a recoil on a woofer for instance.

22nd May 2011, 04:13 PM	#3
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	If the coil is not failing just the lead then this can be re-glued with speaker glue. The loose connection should be soldered. This repair requires some skill so as not to burn the cone or leave too much weight from the repair.

22nd May 2011, 04:40 PM	#4
jakruby diyAudio Member Join Date: Jun 2007	it is just the lead. i have tried soldering. didnt burn the cone but it would not take - perhaps the aluminum wire? will try with another iron and acid core solder i believe that is what one uses for aluminum. i have also seen a product that is used to repair pcb tracks - a sort of paint that is conductive that seems safer to try. i read somewhere that this is a particular lowther issue so hoping someone would enlighten me if there is a specific way to repair it. thanks for the reply digits, i dont think a normal speaker repair place could fix a lowther - they have double wound coils, both inside and outside of the former.

22nd May 2011, 04:47 PM	#5
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	Don't use acid core solder. It will slowly destroy things. Soldering old aluminum has never worked for me. If you want to try, you have to use a bit of lye dissolved in water to first clean the aluminum and then be sure no solution ever touches the cone and all is cleaned off of every other surface. The use a solder alloy designed for aluminum. The double voice coil has been used by quite a few folks. The toughest standards for a recone facility to meet are those of JBL. So look for someplace that is certified by them if you give up. My cost on a 2 ounce tube of speaker glue is $7.00! It is special stuff, but you should be able to buy some on the internet.

23rd May 2011, 05:18 PM	#6
digits diyAudio Member Join Date: Apr 2011	Erm these guys actualy can, they can copy stuff down to the micron, and are being used by some local universities... Loudspeaker Doctor :: Welcome

23rd May 2011, 05:36 PM	#7
jakruby diyAudio Member Join Date: Jun 2007	my apologies digits! i checked out the site, they even have photos of some lowthers. thanks for the tip.