SMPS for class A amps?

folkeb · 16th March 2007, 07:29 PM

Is it possible to think of SMPS for class A amplification? I have previously built a DIY version of the mighty Pass Labs Aleph 1.2 with a conventional PSU. However, I am thinking of building a Aleph 30 or Aleph X to keep my self busy. As I use a SMPS for my DAC with success I was thinking that this may be a good match for the Aleph 30.

Thanks for any insight.

BTW: Is it possible to get SMPS to deliver 60v out (for my preamp)?

Folke

ssmith · 23rd March 2007, 08:52 AM

It's been done in a commercial Class A / AB amp -- here

I have a pair, they have a little hum problem which can be worked around. The SMPS inside puts out 67v / 800VA

Too hot for the climate I live in, and they consume alot of juice. I don't need 200wpc either, so I'm planning on gutting the amp and putting in a lower output and linear class A.

The company eventually discontinued them and changed back to linear.

AndrewT · 24th March 2007, 12:53 PM

Hi,
keep in mind that your ClassA will require rail currents that vary from Ib +-Ib = 0 to 2*Ib.
Will the SMPS manage that?

If it were a push pull topology then max current can be many times Ib.

16th March 2007, 07:29 PM	#1
folkeb diyAudio Member Join Date: Jan 2006 Location: Trondheim	SMPS for class A amps? Is it possible to think of SMPS for class A amplification? I have previously built a DIY version of the mighty Pass Labs Aleph 1.2 with a conventional PSU. However, I am thinking of building a Aleph 30 or Aleph X to keep my self busy. As I use a SMPS for my DAC with success I was thinking that this may be a good match for the Aleph 30. Thanks for any insight. BTW: Is it possible to get SMPS to deliver 60v out (for my preamp)? Folke

24th March 2007, 12:53 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, keep in mind that your ClassA will require rail currents that vary from Ib +-Ib = 0 to 2*Ib. Will the SMPS manage that? If it were a push pull topology then max current can be many times Ib. __________________ regards Andrew T.

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23rd March 2007, 08:52 AM	#2
ssmith diyAudio Member Join Date: Aug 2005 Location: Paris	It's been done in a commercial Class A / AB amp -- here I have a pair, they have a little hum problem which can be worked around. The SMPS inside puts out 67v / 800VA Too hot for the climate I live in, and they consume alot of juice. I don't need 200wpc either, so I'm planning on gutting the amp and putting in a lower output and linear class A. The company eventually discontinued them and changed back to linear.

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