Rogers LS3/5a speakers just blown

Status
Not open for further replies.
Jump to Latest
#43
Thanks Sreten,
I will try some damp tissue around the dustcap & let it soak for a few hours!

I believe this speaker used a Nomex former that the voice coil was wound around. Does anybody know where I might source one of these or Nomex material to make my own?
 
#45
I'm not sure how's the progress with repairing those woofers but I talked to my friend today (he still didn't have time to dig those LS 3/5 out ;( and he said that even
the 15 Ohm versions were using standard 8 OHM KEF driver that I see pretty much everyday on Ebay . Regards, L
 
#46
#47
The crossover was rising the impedance to 15 Ohm. The woofers are 8 Ohm. The only thing is that the 15 Ohm period woofers used Bextrene stock that did not lead to the 1.5kHz resonance that was discovered later as the base material changed properties from its mass volume producers. That was fixed later again.
 
#50
jkeny said:
That explains somewhat the preference for the so called white bellied B110s that I have - these are the Bextrene cones with PVA glue? (white around dustcap).
Click to expand...

The old production had that visual characteristic. And coincides chronically with the pre resonance problem era. It may well be explaining the preference. Some others used to say, prefer the bulk and not the individually packeted B110s. Maybe that change coincides chronically with older to newer transition too.
 
#52
Before the B110s got packed individually in 'constructor series' boxes for the DIY market of the 80s, they used to ship them in bulk on palettes. Some experienced DIYers used to prefer the bulk shipped older drivers for sounding better.
 
#53
Aha!, you know a lot about the history of the LS3/5As!

My speakers came from a recording studio - so probably one of these bulk drivers rather than a constructors pair. I checked the serial numbers & the inspection QC tag & AFAIR they are late 70's era speakers!

The more I hear about these speakers the more I kick myself!!!!!!
 
#55
Michael Noble from RAtechnologies does recone/repair but the price is too steep for me £120 per drive plus shipping plus VAT @ 17.5%.

Just too costly for me - over £300 (400 euro or $700)

Edit: Stirling broadcast do not repair anymore, stating that since the price madness happened with these speakers parts also became overpriced - I agree
 
#58
In their defense they say it's a difficult job taking about 4 hours work, which is just £30 per hour and they also state that there are no spare parts available anywhere in the world so everything has to be recovered from the speaker and the recovered voice coil put on a new Nomex former which they supply!

Michael is a gentleman, based on my emails, & I would have been happy to do business with him but I just am a skinflint, I guess!
 
#60
Hmmm, I didn't think of that, I did ask if he knew of anywhere I could get a small amount of Nomex to wind my own former - he may be sending me some, I'm not sure!

So that's why I think he's a gentleman.

I'll go to the stage of taking the whole lot apart & if it's problematic to get the voice coil (which seems OK as both measure 6.6 ohms with a multimeter) onto a new former, I might follow this up with him.

I tested the cones by hand - one moves in & out with a scraping noise but other seems pretty stuck so I don't want to force it. I'm hoping that this means it's just the former that's distorted with heat from the DC in the voicecoil!

I was also hoping that the voicecoils might come off the formers as one cylindrical coil & I can fit this to a new former but this is all conjecture until I get in there!
 
Status
Not open for further replies.
Top Bottom