SpeakerTalk

Ripcurler · Introductory Contributor Joined: 06 Sep 2016 Posts: 8

I'm hoping someone can help me. I have a pristine pair of Celeste iv except the voice coils on both tweeters are open circuit. Careful disassembly and inspection with a loupe shows that the wire is broken on the voice coil itself. The tweeters look identical to the t33-a sp1074 but have a plain white kef label with the numbers 2782. I can't find any info on these anywhere. Assuming that they are the t33 - are replacements diaphragms still available?
If not would the Audax TW025A0 (is there a better match) disassemble and fit the original faceplate?

Any help would be greatly appreciated

speakerguru · Posted: Sun Sep 18, 2016 5:44 pm Post subject:

I'm pretty sure the first cloth sock covered Celeste and Concorde (III?) offerings from KEF used the Audax 1" soft dome tweeter. It proved to be unreliable, often going open circuit. I seem to recall the Celeste and Concorde IV used a Panasonic tweeter instead.

Ripcurler · Introductory Contributor Joined: 06 Sep 2016 Posts: 8

Do you mean that the tweeters were built by audax to the kef design? I have taken some photos of the tweeters - they look very much like the t33 sp1074. I think the audax had a circular front panel

speakerguru · Posted: Tue Sep 20, 2016 9:47 am Post subject:

Your link just takes me to the Photo Box front page, not your album, so I can't see the pictures. Do I need to have an account to view?
Anyway, I meant the regular round plate Audax. I did not remember KEF having started out using T33s in that model but I'll take your word for it.

History: the Celeste had to be built to hit the £100/pair price point in the shops. This meant buying in the tweeters, having a paper cone B200s made to KEF spec by ELAC (then in North London) and not having veneered cabinets.

audiolabtower · VIP Contributor 500+ Joined: 06 Jan 2009 Posts: 686

https://www.photobox.co.uk/album/4417045026

is the reconstructed link, but I still can't expand the pics for a closer look.

Ripcurler · Introductory Contributor Joined: 06 Sep 2016 Posts: 8

Sorry about the link. I have created a photobucket account so hopefully that will be better.... new link below

http://s38.photobucket.com/user/stuartnwatson/library/KEF%20T33

Ripcurler · Introductory Contributor Joined: 06 Sep 2016 Posts: 8

The B200 bass drivers are the paper coned SP1070, three point fixings and mechanically isolated from the sealed cabinet. Here is a picture of the bass driver http://s38.photobucket.com/user/stuartnwatson/library/B200%20SP1070

speakerguru · Posted: Wed Sep 21, 2016 8:42 am Post subject:

Photobucket links work.

That is a KEF T33; probably the SP1074 8 Ohm nominal impedance, 6.6 Ohms d.c. resistance. I'm beginning to forget SP numbers!

Sorry I can help with XO component values. You definitely need to replace the electrolytic capacitors which should all be bipolar types.

Ripcurler · Introductory Contributor Joined: 06 Sep 2016 Posts: 8

The voice coils in these T33s are not fluid cooled. The new diaphragms have arrived - would you advise using ferro fluid in the rebuild?

speakerguru · Posted: Wed Oct 05, 2016 7:46 am Post subject: