SpeakerTalk Forum Index SpeakerTalk
This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

104/2 LF B200 Replacement

 
Post new topic   Reply to topic    SpeakerTalk Forum Index -> KEF speakers
View previous topic :: View next topic  
Author Message
tvizzini
Introductory Contributor


Joined: 22 Sep 2005
Posts: 1

PostPosted: Thu Sep 22, 2005 7:07 pm    Post subject: 104/2 LF B200 Replacement Reply with quote

Hello:

New to the site, LOVE IT!!!

I have looked though all the postings and anatomy snapshots. I have not been able to find a breakdown schematic for the 104/2.

My project is to replace the LF B200 speakers.

Thanks for the help,

Tyson
Back to top
View user's profile Send private message
SoundAsAnOldEngineer
Introductory Contributor


Joined: 06 Oct 2005
Posts: 7
Location: Devon, UK

PostPosted: Thu Oct 06, 2005 9:39 am    Post subject: Reply with quote

Hi Tyson,

I have located a couple of secondhand SP1256 (B200) units from some dismantled 104.2s. They are in the UK. Is this any use to you?

Mark
Back to top
View user's profile Send private message
ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Thu Oct 06, 2005 3:53 pm    Post subject: Reply with quote

Quote:
I have not been able to find a breakdown schematic for the 104/2.


I've seen this type of post on the Internet so often.

I will admit to owning an LCR meter and SteveB has access to one, but unless someone contributes a non-returnable circuit board for dismantling you'll have to work out the circuit yourself.
As the inductors are colour coded like resistors or capacitors, you can get their approximate integer values, which should be close enough for your purposes.
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Thu Oct 06, 2005 9:20 pm    Post subject: Reply with quote

Easy Peasy!
I do not always trust my LCR meter, but there is an easier way out.

I have a copy of the schematic for the 104/2 circa 1990.
It is size A3, and my computer scanner is not working at the moment.

Being as already I am of the Christmas spirit I am willing to send a recipient a photo copy free of charge if the need is so great.
Not for re-distribution!
Back to top
View user's profile Send private message Send e-mail
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Thu Oct 06, 2005 9:27 pm    Post subject: Reply with quote

Are you replacing the bass units because they are bust or just for the hell of it? Shocked
Back to top
View user's profile Send private message Send e-mail
ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Thu Oct 06, 2005 9:43 pm    Post subject: Reply with quote

Quote:
I do not always trust my LCR meter


Whatcha got?

Mine's a Meterman LCR 55 calibrated to Meterman's method and checked against an Aglient (Hewlett-Packard) bridge maintained to UKAS, etc., standards.
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Thu Oct 06, 2005 10:09 pm    Post subject: Reply with quote

Now this is where I blush most strongly!

It is an Atlas PEAK pocket LCR meter.
Performs as you would expect for an instrument costing £80!

I do have access to a friends HP device half the size of a filing cabinet and nice it is too. Cannot remember the Model Number at the moment.

But that is a few miles away... The spec for the Atlas is fair for what I use it for when the wind is from the right direction.

http://www.maplin.co.uk/Media/PDFs/N54AA.pdf

A world of difference when using a proper instrument...
Back to top
View user's profile Send private message Send e-mail
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Thu Oct 06, 2005 10:31 pm    Post subject: Reply with quote

The one in the tool box is a UNIT-T UT70A.
I trust this one about as much...

http://www.justhandhelds.com/Merchant/merchant.mv?Screen=PROD&Store_Code=01&Product_Code=03004&Category_Code=99-103

Must find myself a nice vintage H.P. sometime. Sad
Back to top
View user's profile Send private message Send e-mail
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Fri Oct 07, 2005 7:01 pm    Post subject: Reply with quote

Ok, my reference is the HP 4192A.
http://www.testequity.com/products/150/

As far as I am concerned Agilent is the name for lasers!
This ageing beast is staggeringly accurate. I only wish I had more access to it!

No requests for the 104/2 schematics as yet... Shocked
Back to top
View user's profile Send private message Send e-mail
oplancq
Intermediate Contributor 50+


Joined: 30 Apr 2003
Posts: 61

PostPosted: Mon Oct 10, 2005 7:23 am    Post subject: Reply with quote

proffski wrote:
Ok, my reference is the HP 4192A.
http://www.testequity.com/products/150/

As far as I am concerned Agilent is the name for lasers!
This ageing beast is staggeringly accurate. I only wish I had more access to it!

No requests for the 104/2 schematics as yet... Shocked


Hello, if you schematics of 104/2 xovers in electronic version, I'd be quiet interested to receive a copy...

Thanks much,
_________________
Olivier
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Mon Oct 10, 2005 8:49 am    Post subject: Reply with quote

I have sent Personal Message via this site.
Andreas.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    SpeakerTalk Forum Index -> KEF speakers All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group