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-   -   Looking for unbalanced to balanced transformer (http://www.diyaudio.com/forums/tubes-valves/204568-looking-unbalanced-balanced-transformer.html)

merlin el mago 15th January 2012 03:34 PM

Looking for unbalanced to balanced transformer
 
I am looking for unbalanced to balanced transformer like Lundhal, Sowter, etc. Could you recommend me a particular model & the way to connect the wires?

Pano 15th January 2012 03:46 PM

Do you need an input transformer? Just about any of good the 1:1 models will do, Jensen, Cinemag, Edcor, Lundhal, old Peerless, etc.

Connect one side of the primary to signal hot, the other to ground. Connect the wires of the secondary to your balanced circuit.

merlin el mago 15th January 2012 04:04 PM

So I just to ask 1:1 models, this one Lundhal LL6404 is OK?

http://www.lundahl.se/pdfs/datash/6404.pdf

Pano 15th January 2012 04:24 PM

Yes, that should do the trick. Sometimes you need to connect the center tap to ground, and this model has no center tap. Usually not a problem, tho.

merlin el mago 15th January 2012 04:25 PM

Thank you Pano.

merlin el mago 15th January 2012 05:35 PM

To have a gain of +3 dBs like the balanced signal how many turns ratio must have the step up transformer?

zigzagflux 15th January 2012 06:03 PM

Turns ratio follows voltage ratio. 3dB = 20log(1.41), so that would be 1:1.41 turns ratio. 6dB would be twice the gain [20log(2)], which is 1:2. You will probably be more successful finding a 1:2 step up than a 1:1.41.

Pano 15th January 2012 06:06 PM

Yep, I've had some 1:1.41 transformers custom made, but never seen any in a catalog. 1:2 will do fine.

merlin el mago 15th January 2012 06:13 PM

The Lundahl LL7101 can do the trick?

http://www.lundahl.se/pdfs/datash/7101.pdf

David Davenport 15th January 2012 11:43 PM

The LL1690 works for me.

http://www.lundahl.se/pdfs/datash/1690.pdf


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