U73B Vari-mu limiter trafo selection

[just.sounds]

So after a symetrical fet and a la3a i want to sink my teeth in a TAB V73B limiter. And found some good docu on Kubarth's page
http://audio.kubarth.com/rundfunk/index.cgi

As trafo's are still a bit mysterious to me so i'm asking for your help to select the right input, interstage and output trafo.

They are labeled 1:1  T188 Wich looks like a centre tapped and shielded 1:1 trafo. And i was thinking maybe something like a lundahl 1540 would do the trick.

And there is also the output 10:1 CTV 72/2 and i'm searching for something that works there. I can't find any impedances for those trafo's.

Could anyone shed some light on this iron?

Kind regards

Boy Griffioen

 

[MatthisD]

Not the LL1540 for the interstage or sidechain output. It is a small nickel core not suitable for those positions.  It could be used as the input transformer.

I can tell you that the LL1630 works at the output replacing the plate coupling choke and the transformer.  LL1635 P-P for the interstage looks well suited.

As trafo's are still a bit mysterious to me so i'm asking for your help to select the right input, interstage and output trafo.

They are labeled 1:1  T188 Wich looks like a centre tapped and shielded 1:1 trafo. And i was thinking maybe something like a lundahl 1540 would do the trick.

And there is also the output 10:1 CTV 72/2 and i'm searching for something that works there. I can't find any impedances for those trafo's.

Could anyone shed some light on this iron?

Kind regards

Boy Griffioen

 

[just.sounds]

Tnx!!

I also found some info on this T188 (maybe faulty does not look alike)
http://www.tube-classics.de/TC/Klangfilm/MCPre/MCPreSieData.htm

http://groupdiy.com/index.php?topic=34368.0

 

[MatthisD]

You can see one of the T188s exposed in the U73 chassis.