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Old 10th October 2002, 11:56 PM   #1
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Question Stan Curtis' 60W Class A Amp

Has anyone built or looked at this design? I am interested in looking at building a Class A amp for my system. Let me know what you think. All suggestions welcome. Thanks

http://www.gmweb.btinternet.co.uk/curtispwr.htm

Later
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Old 11th October 2002, 03:52 AM   #2
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I would categorize this as a project for someone with
some experience, as it is more complicated than a
Zen or a KSA50. On the other hand, there doesn't
appear to be anything wrong with it.

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Old 11th October 2002, 05:07 AM   #3
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It seems to be a proper design in my eyes.

If the distortion figures are true, they are rather impressive if one takes th rather low loop-gain into account.

Nelsson:

Nice to see you here.
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Old 13th October 2002, 11:52 AM   #4
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Audiofng

Are you thinking to use this amp as it is,or maybe for bi-amped configuration?
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Old 13th October 2002, 02:49 PM   #5
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Thank you everyone for your replies. I am very new to DIY Electronics, electronics in general actually. Some of my questions may reflect this so please bear with me.

Nelson, thanks for the input, I am definitely looking closer at the Zen Amps, mainly because of the level of support you and others give. I have been known to be a little ambitious at times though, hence the Curtis' amp.

Shadow, I plan on using the amps as is. Actually my ultimate goal is quite extensive. This is only the first step. My completed set up, as I plan it now will be:

2 Mono 60W Class A - 2 Channel Stereo Music Only
6 Mono ESP Project 3A Amps - Multi channel Home Theatre

All of this will be run from my HTPC (in progress of being built)
Using this as my pre-amp, all digital decoding being done via software allowing it to be upgraded anytime plus ability to try different things in the never ending search for the best you can get. I know this statement may start a fight but it is what I have, so maybe it should be stated as "the best you gan get with what you have".

I may look at bi-amping and active crossovers down the line but they are not planned as of yet. I am going to wait and see how difficult it is to build and how much it costs before I look at bi-amping.

Needless to say I have alot of learning yet to do.

Any help is verrry welcome. Thanks everyone


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Old 13th October 2002, 02:56 PM   #6
mlloyd1 is offline mlloyd1  United States
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Default Re: Stan Curtis' 60W Class A Amp

No comments on the Stan Curtiss design yet.
But, if you really want Class A and don't want to try any Zen or X stuff, I would really strongly recommend taking a look at Nelson's 20W Class A amp from 1977 (don't be concerned about the date!): http://passdiy.com/pdf/classa_amp.pdf

For those of use with vast collections of nice bipolar output devices that are begging for a project to be used in, to my mind this is the one. I still think it is a stellar performer. I know folks who have built these, still use 'em and won't trade for anything.

Who knows all the tweaks and mods you could do to this design!

mlloyd1

[QUOTE]Originally posted by Audiofng
....I am interested in looking at building a Class A amp for my system. Let me know what you think. All suggestions welcome. QUOTE]
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Old 13th October 2002, 03:02 PM   #7
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It looks ok to me, but a little complicated.

I would like something with a balanced input pair.
I would make something simpler also. Not as a beginner but it sounds also better.
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Old 14th October 2002, 08:26 AM   #8
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I remember the Stan Curtis amp project from when it was first published. It was, as I recall, very well regarded by many. At least two companies were selling the project as a kit of parts for several years.

Even considered it myself, but being a penniless student at the time....I do still have the original article though.

Cheers

Paul
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Old 14th January 2006, 08:52 AM   #9
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Take a look at my variant:
http://cp.people.overclockers.ru/cgi...lA_tweaked.gif

hmm.. may be this link works better:
http://files.people.overclockers.ru/...lA_tweaked.gif
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Old 14th January 2006, 09:12 AM   #10
lineup is offline lineup  Sweden
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the link in first post has changed

here you will find schematic and article of
Stan Curtis 60W Class-A Amplifier

.... and some other Class A amplifiers

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