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folkeb 16th March 2007 08:29 PM

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)?


ssmith 23rd March 2007 09:52 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 :hot: 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 01:53 PM

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.

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