• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

IMF owners thread!

The cracking is common on the ELAC midranges of that era. New foams are available from Ebay seller good_hifi who also has a business in Netherlands. You do need to specify the specific midrange driver as there were two variants and they use different foams.
 
Thanks mech986, I'm afraid these pictures are the best labels from both speakers. Seems like these speakers have had all tweeters renewed and not only the crossovers done. One of the tweeters was dead, the burn had occurred between the faceplate and the voice oil, so I managed to make connection. It's condemned dead but temporary functioning. I must renew these anyway. Wonder if there are sensitivity differences on the tweeters compared to the originals? So now, to get crossover right is the major task.

It seems like these speakers where sold here in Denmark in 1979, according to old hifi magazines.
 
Last edited:
Hi, it have the woofer with rib but small magnet like kef sp 1014 and not like kef sp1039. I have a question for everyone who own Tls 50 Mk II, looking at all the pictures, I have never see a STW coles 4001 only the faceplate with microphone like the Tls MK I. The coles have distinctive curved line around the dome, easy to notice I really like to see the back of an original STW Tls 50 MK II.
 
BoPtiljudrop said:
Thanks mech986, I'm afraid these pictures are the best labels from both speakers. Seems like these speakers have had all tweeters renewed and not only the crossovers done. One of the tweeters was dead, the burn had occurred between the faceplate and the voice oil, so I managed to make connection. It's condemned dead but temporary functioning. I must renew these anyway. Wonder if there are sensitivity differences on the tweeters compared to the originals? So now, to get crossover right is the major task.

It seems like these speakers where sold here in Denmark in 1979, according to old hifi magazines.
Click to expand...

Hey there,

Cool find! The IIa is a rare bird, you don't see many of those around. They were the upgraded model from the II, before the Studio Monitor was released in the 80s.

It seems to me that the super tweeters were replaced at some point with modern equivalents. Having a look at them, and the baffle, I would say that was the case.

Your best bet from here is, as mech986 stated, to contact Jerry Bloomfield at Falcon Acoustics and have him help you determine what the correct capacitors would be. I don't think it will take much work to bring these back to an original state once you have the Coles super tweeters and also the correct capacitors in place. The inductors look original to me, so I'd be surprised if you need to replace those.

Also, the damage on the board by that resistor, I would be replacing that resistor if it were me.

Good luck!
 
Hi canuckaudio, hope you're right.

All the units DCR looks fine. A bit under the nominated 8ohm.

The magnet on the bass isn't exactly small, the ferrite part is really beefy. Here's a version of the Coles 4001 from B&W DM4, another speaker in need for some care:

IMAG3861.jpg
 
Last edited:
hi,yes the magnet is thick, but the diameter is small compared to some Tls 50 MkII with the Kef Sp 1039. I suppose to buy back my set of DM2a transmission line with the woofer on top with the same units as yours. Great speakers
 
Hi I just saw a pair similar to you TLS MK II a for sale in the UK surrey at : retrotechaudio.co.uk,they have stand and are in fantastic condition.If someone bought these or you can try contacting them and trying to get a pictures of the X-over,they just have to unscrew one woofer, but maybe you will have to offer something in return?
Yvan
 
Yvan_donald said:
Hi I just saw a pair similar to you TLS MK II a for sale in the UK surrey at : retrotechaudio.co.uk,they have stand and are in fantastic condition.If someone bought these or you can try contacting them and trying to get a pictures of the X-over,they just have to unscrew one woofer, but maybe you will have to offer something in return?
Yvan
Click to expand...
Interesting! I'll take a look, thanks. They are playing right now, but I'm not at all shure if I have found the right value on the C2. But it is a great speaker, think I'm close.
 
So, I have made a question about the crossover, with some luck he has already had the crossovers inspected, and maybe knows what the C2 should be. I have put in a 60uf, like the TLS50II. All recaps I have done are polycaps/film caps. This is of course not the way they were made, but until I know the exact values, this must be the solution.
 
Hi, Plus these do not have Coles tweeter's but the same as Tls MkI, kind of microphonic type unit with no magnet, press fit to a front plate..
 
Starting to know the forum a little better, I wonder if I should have made a new forum thread for the restoration process? Well, hopefully I soon can put up the correct crossover layout and that will be it.
 
Hi,here is the IMF official (keep info at one place) so if you open a thread in other section it will be lost after many news threads will appear and harder to retrieve. That's my opinion,Yvan.
 
Hi guys-

PIcked up a pair of IMF Super Compact II today. Both midrange surrounds trashed (no problem) one Audax tweet inop (I have a spare, so no problem) but one midrange is dead. I disassembled it and voice coil actually fell apart in the gap.
I'll take this to my repair guy, or may try to install new voicecoil myself.

Will need new caps, no doubt.

Teak cabinets!!!
 
Nashou66 said:
Nice! We need pics or it never happened!!! ;)

Nashou
Click to expand...

Pretty sure they look like every other pair of Super Compact II in Teak. :)

Anyway, has anybody ever tried replacing the voicecoils on these ELAC mids? They are dual wound 20.4mm diameter. So far no luck finding that particular winding/diameter.
 
Thanks for the tip. I've determined both minds are toast, so need to recalibrate strategy...
 
Took out the crossover today. Burn marks under the 15 ohm resistor (although it still tests good). Caps are within spec and ESR using my meters, but I'm going to replace them all in any case.
 
You must log in or register to reply here.
Back
Top Bottom