How to use single ended inputs with X power amps?

Petter · 26th February 2003, 08:15 AM

I remember that NP once said something about how to set up an X series stage for single ended operation. I have searched the forum frantically for that post without success.

I would like to have verified that the standard method for hooking up a single ended input to a balanced amp (i.e shorting the un-used input to ground using a resistance which is the same value as the source resistance) is the recommended way also for X-style units.

Petter

Petter · 27th February 2003, 02:47 PM

Any takers?

jam · 27th February 2003, 02:53 PM

Petter,

I believe you short pins 1 and 3 for most of the X-amps. I don,t think the X-1000 or X-600 respond as well to this for some reason, maybe because of the folded cascode?

Why don't you try it? Maybe a transformer on the input is the answer but I don't think the Master favours them. Maybe a simple phase inverter is the solution.

Regards,
Jam

Peter Daniel · 27th February 2003, 04:13 PM

Check A75 article. He explains there how to match source impedance on not driven input. Also this thread contains lot of info on balanced lines. Especially comments by Steve Eddy Balanced line

Petter · 27th February 2003, 08:06 PM

I have tried it, but did not get the expected result, so I was wondering if there was a special trick for doing it.

The reason for testing was that the signal generator + analyzer I was getting access to are both single ended.

Transformers next I suppose

Will check out links

Petter

27th February 2003, 04:13 PM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Check A75 article. He explains there how to match source impedance on not driven input. Also this thread contains lot of info on balanced lines. Especially comments by Steve Eddy Balanced line __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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27th February 2003, 02:47 PM	#2
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	Any takers?

27th February 2003, 02:53 PM	#3
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Petter, I believe you short pins 1 and 3 for most of the X-amps. I don,t think the X-1000 or X-600 respond as well to this for some reason, maybe because of the folded cascode? Why don't you try it? Maybe a transformer on the input is the answer but I don't think the Master favours them. Maybe a simple phase inverter is the solution. Regards, Jam

27th February 2003, 08:06 PM	#5
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	I have tried it, but did not get the expected result, so I was wondering if there was a special trick for doing it. The reason for testing was that the signal generator + analyzer I was getting access to are both single ended. Transformers next I suppose Will check out links Petter

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