Help with 1:2 line level input Tx's

Troncones · 24th August 2011, 02:42 PM

I have a SE 2A3 amp with choke loaded (150H) 6J5 drivers. The sensitivity is around 2Vrms. I would like to get this down to about 1Vrms. A friend suggested using line level 1:2 Tx's at the inputs.

Morgan Jones doesn't address the topic so I'm lost.

Will this work?

Where can I find design/application text?

Where can I get the Tx's?

Or....any comments or suggestions.

Thanks

revintage · 24th August 2011, 03:49 PM

Try the amorphous Lundahl LL1676. Great transformer! But you should go 2:1, not 1:2!

zigzagflux · 24th August 2011, 04:14 PM

1:2 sounds about right to me. You want to step the voltage up from 1V to 2V, so the amp is more sensitive, correct?

Steve Eddy · 24th August 2011, 04:25 PM

Quote:

Originally Posted by revintage

Try the amorphous Lundahl LL1676. Great transformer! But you should go 2:1, not 1:2!

He's wanting to change the input sensitivity from 2 volts to 1 volt, which would require a step-up transformer, in which case the proper nomenclature would be 1:2, not 2:1.

se

artosalo · 24th August 2011, 04:27 PM

Hammond 560Q is good and fairly priced:
Hammond Mfg. - Broadcast Quality Audio Transformers - (560, 800-844 & 850 Series)

revintage · 24th August 2011, 05:05 PM

Sorry, missread your post. In this case, note input impedance will be lowered 4 times.

Steve Eddy · 24th August 2011, 05:33 PM

Quote:

Originally Posted by revintage

Sorry, missread your post. In this case, note input impedance will be lowered 4 times.

Yup!

se

24th August 2011, 02:42 PM	#1
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	Help with 1:2 line level input Tx's I have a SE 2A3 amp with choke loaded (150H) 6J5 drivers. The sensitivity is around 2Vrms. I would like to get this down to about 1Vrms. A friend suggested using line level 1:2 Tx's at the inputs. Morgan Jones doesn't address the topic so I'm lost. Will this work? Where can I find design/application text? Where can I get the Tx's? Or....any comments or suggestions. Thanks __________________ The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.

24th August 2011, 03:49 PM	#2
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Try the amorphous Lundahl LL1676. Great transformer! But you should go 2:1, not 1:2! __________________ Brgds Lars

24th August 2011, 05:05 PM	#6
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Sorry, missread your post. In this case, note input impedance will be lowered 4 times. __________________ Brgds Lars

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24th August 2011, 04:14 PM	#3
zigzagflux diyAudio Member Join Date: Oct 2006	1:2 sounds about right to me. You want to step the voltage up from 1V to 2V, so the amp is more sensitive, correct?

24th August 2011, 04:27 PM	#5
artosalo diyAudio Member Join Date: Feb 2010	Hammond 560Q is good and fairly priced: Hammond Mfg. - Broadcast Quality Audio Transformers - (560, 800-844 & 850 Series)

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