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Chasing an IMF TLS 50 MkI schematic

 
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mikeytheo
Intermediate Contributor 25+


Joined: 16 Apr 2007
Posts: 33
Location: Sydney Australia

PostPosted: Thu Apr 02, 2009 12:05 pm    Post subject: Chasing an IMF TLS 50 MkI schematic Reply with quote

Title says it all - on the off chance that anyone here has access to one.
I'm building a pair of the above, beginning with bare cabinets I sourced. Have the driver set now (am short one mid!) and need to build the crossovers. I am a member at the IMF Yahoo group. There are MkII schematics there, but not MkI which used a slightly different driver set.
Drivers I will be using are:
KEF B200 SP1014
Audax 12x8 D25 tweeter
Elac 4/200 mid
Coles STG 4001 super tweeter
Thanks,
M
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ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Thu Apr 02, 2009 7:37 pm    Post subject: Reply with quote

I've got the 1977 IMF mkII where L1 is 4mH (for Dalesford units) also another TLS 50 where L1 is 5.75mH (unknown drivers) and the main pcb mask.

The mk1 TLS 50 that I knew used a Peerless KO40MRF and DT10HFC plus Coles and KEF drivers, later versions used that horrible AKG headphone earpiece supertweeter.

So my earlier diagram is either the second or third version of the mk1, any use Very Happy .
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Wiesiek Lipowski
Intermediate Contributor 25+


Joined: 10 Dec 2006
Posts: 39
Location: Poland

PostPosted: Thu Apr 02, 2009 10:14 pm    Post subject: Reply with quote

Hi, you can find some info here:

http://imf-electronics.com/timeline.html
http://imf-electronics.com/TLS50/index.html
http://imf-electronics.com/SuperCompact/index.html

Good luck
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Wiesiek
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mikeytheo
Intermediate Contributor 25+


Joined: 16 Apr 2007
Posts: 33
Location: Sydney Australia

PostPosted: Fri Apr 03, 2009 2:58 am    Post subject: Reply with quote

Many thanks for the quick response. I thought I had dredged all the info from the IMF site, but there was a little gem in your links. If I read correctly, the Super Compact uses an identical crossover to both the TLS50 and the ALS50. If this is so, I have saved a huge amount of time - as I have three Super Compact crossovers! - Just checked pics of the TSL50 II and the crossover differs markedly from the Super Compact. Will pose the question re Super Compact in comparison to TSL50 I.

Regarding the driver set, there doesn't seem to be a lot of agreement even on the IMF forum as to a definitive answer. I think think that IMF were constantly changing suppliers and from the looks of things using what was available at the time. Within the forum discussion, people who own the speakers and even long term repairers swear and declare that the driver sets they have seen are correct - and differ from what others have.
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