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Old 15th January 2012, 03:34 PM   #1
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Question 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?
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Old 15th January 2012, 03:46 PM   #2
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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.
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Old 15th January 2012, 04:04 PM   #3
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So I just to ask 1:1 models, this one Lundhal LL6404 is OK?

http://www.lundahl.se/pdfs/datash/6404.pdf
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Old 15th January 2012, 04:24 PM   #4
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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.
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Old 15th January 2012, 04:25 PM   #5
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Thank you Pano.
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Old 15th January 2012, 05:35 PM   #6
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To have a gain of +3 dBs like the balanced signal how many turns ratio must have the step up transformer?
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Old 15th January 2012, 06:03 PM   #7
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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.
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Old 15th January 2012, 06:06 PM   #8
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Yep, I've had some 1:1.41 transformers custom made, but never seen any in a catalog. 1:2 will do fine.
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Old 15th January 2012, 06:13 PM   #9
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The Lundahl LL7101 can do the trick?

http://www.lundahl.se/pdfs/datash/7101.pdf
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Old 15th January 2012, 11:43 PM   #10
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The LL1690 works for me.

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