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Old 2nd February 2002, 04:00 PM   #1
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Default Class A high-end amp?

Has any body a Class A amp plan, mosfet, high-end. 25 W per chanel aprox.? I Woul like put at the input an 1 V line level? I think woul be a power amp (without preamp). Thanks.
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Old 2nd February 2002, 04:44 PM   #2
PassFan is offline PassFan  United States
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Default PASS DIY

He has a few class a designs.
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Old 2nd February 2002, 05:20 PM   #3
mlloyd1 is offline mlloyd1  United States
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There is also the Lang Class A amp from "Audio Electronics" (formerly known as "The Audio Amateur" when the project appeared. I think their web site still lists the PCB for sale. The TO3 metal case lateral Hitachi MOSFETs are no longer produced though. You could do a little surgery to use some of the TO3P or TO247 plastic package lateral MOSFETs from Hitachi or Toshiba.

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Old 4th February 2002, 12:03 PM   #4
Werner is offline Werner  Europe
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Default Hawk A18 kit?

It's a commercial kit, not a project. A PP 20W class AB amp (10W class A) without loop feedback.
I just had one in for review, and it is indeed a very sweet but powerful and solid performer.

Click the image to open in full size.
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Old 4th February 2002, 06:27 PM   #5
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The upcoming Zen with an active current source
will reach those levels. Should be out in 3 weeks.
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Old 4th February 2002, 06:29 PM   #6
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Default class A amplifier

I found this URL

have you experience with these circuits?

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Old 4th February 2002, 07:03 PM   #7
Geoff is offline Geoff  United Kingdom
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It depends which one(s) you are interested in. There are a number of different Class-A designs on my website ranging from the Hiraga 'Le Monstre' at 4Wrms into 8ohm to Stan Curtis' 60W circuit. I haven't built them all, but can recommend the JLH Class-A which has been highly regarded for the past 30 years and is still generating very favourable comments from new constructors.

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