speaker repair wizzard needed

limono · 5th April 2009, 04:38 AM

OK !having spent all my money on EV , TAD , Lowthers I've got in my posession a pair of JBL LE8 (old rusty alnico mags) full range drivers with surrounds changed. Frankly, these are the best drivers I ever heard. Tonally, they smoked Enabled lowthers DX4's and nothing (maybe some vintage Tannoys I briefly heard years ago) comes close to my ears. There are two problems with them . Voice coils are partially shorted and both drivers measure 1.3 ,1.5 Ohm DCR . Painted aluminium dust cap was ,is, a little ringy.
Is there anybody who could for resonable (very) amount of money:
take them appart (I probably can do it ) check if the short in VC can be fixed
eventually rewind the VC (maybe even with silver wire ) ,try phase plug instead of alu dust cap (I intend to use a tweeter anyway) measure the speakers ,play with them as long as one pleases and send them back??
Regards, L

Cal Weldon · 5th April 2009, 10:08 PM

Did they look anything like this?

Cal Weldon · 5th April 2009, 10:09 PM

.

limono · 5th April 2009, 11:15 PM

Little better

I don't expect miracles ,hehe
These are first (or one of the first) LE-8 .Your fine samples are I gues LE-8T.
They do play fine on mikro Watt level .

limono · 5th April 2009, 11:22 PM

Oh , I think I know what you're thinking .Is it possible??
Regards, L

Cal Weldon · 5th April 2009, 11:43 PM

What I'm thinking is...

The price to recone made mine expendable. No one wanted to use anything but original parts and that would have cut way too far into the beer fund. I agree they are a great driver but honest to betsy these were going to cost 300USD each cone plus install and shipping. No, I gave them to charity.

The dust caps on mine were attached to the top of the coil so they got that extra bit of extension. Yes they were the LE8T. Thanks for the pic of yours.

limono · 5th April 2009, 11:51 PM

OK I thought that you still have them and since the cones are trashed the coils could be reused.I know that original recone kits are $$$ (if you can get them). Well time to prepare acetone and a razor blade

Best , L

pinkmouse · 6th April 2009, 12:20 AM

Quote:

Originally posted by limono
Well time to prepare acetone and a razor blade

Try a hot air gun and palette knife first.

limono · 6th April 2009, 02:42 AM

Hot air gun to loose up suspension ? It's been 20 years since I repaired a speaker and I remember we usually soaked up suspension (upper and lower) with acetone and waited overnight to loose it up . Than mandrel with thin paper around matched to voice coil diameter. Than search for magnet wire...

picopos · 6th April 2009, 02:51 AM

hey
probably was exposed to dc and if u still have a reading in impedance u r lucky as i would only open them and treat the coil...well i did it before with results ,they still work...
open them and keep posting,good luck

marco

5th April 2009, 04:38 AM	#1
limono diyAudio Member Join Date: Mar 2007	speaker repair wizzard needed OK !having spent all my money on EV , TAD , Lowthers I've got in my posession a pair of JBL LE8 (old rusty alnico mags) full range drivers with surrounds changed. Frankly, these are the best drivers I ever heard. Tonally, they smoked Enabled lowthers DX4's and nothing (maybe some vintage Tannoys I briefly heard years ago) comes close to my ears. There are two problems with them . Voice coils are partially shorted and both drivers measure 1.3 ,1.5 Ohm DCR . Painted aluminium dust cap was ,is, a little ringy. Is there anybody who could for resonable (very) amount of money: take them appart (I probably can do it ) check if the short in VC can be fixed eventually rewind the VC (maybe even with silver wire ) ,try phase plug instead of alu dust cap (I intend to use a tweeter anyway) measure the speakers ,play with them as long as one pleases and send them back?? Regards, L

5th April 2009, 11:43 PM	#6
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	What I'm thinking is... The price to recone made mine expendable. No one wanted to use anything but original parts and that would have cut way too far into the beer fund. I agree they are a great driver but honest to betsy these were going to cost 300USD each cone plus install and shipping. No, I gave them to charity. The dust caps on mine were attached to the top of the coil so they got that extra bit of extension. Yes they were the LE8T. Thanks for the pic of yours. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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5th April 2009, 11:22 PM	#5
limono diyAudio Member Join Date: Mar 2007	Oh , I think I know what you're thinking .Is it possible?? Regards, L

5th April 2009, 11:51 PM	#7
limono diyAudio Member Join Date: Mar 2007	OK I thought that you still have them and since the cones are trashed the coils could be reused.I know that original recone kits are $$$ (if you can get them). Well time to prepare acetone and a razor blade Best , L

6th April 2009, 02:42 AM	#9
limono diyAudio Member Join Date: Mar 2007	Hot air gun to loose up suspension ? It's been 20 years since I repaired a speaker and I remember we usually soaked up suspension (upper and lower) with acetone and waited overnight to loose it up . Than mandrel with thin paper around matched to voice coil diameter. Than search for magnet wire...

6th April 2009, 02:51 AM	#10
picopos diyAudio Member Join Date: May 2005 Location: elizabeth nj	hey probably was exposed to dc and if u still have a reading in impedance u r lucky as i would only open them and treat the coil...well i did it before with results ,they still work... open them and keep posting,good luck marco