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Old 27th June 2007, 09:37 AM   #1
GK is offline GK  Australia
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Default My 1024W RMS CLASS A+ amplifier.

Early last week I said that I was going to start a new thread on the building/design of my super low THD, 1024W rms (continuous sinewave power) stereo amplifier based on the Technics ďClass A+Ē technique for high class A power with ~one quarter the dissipation.
Some though this a good idea and encouraged it. Unfortunately Iíve been working away from home the last few days on short notice, and havenít been able to finish the schematics for posting, so for now Iíll just post a picture of the heatsinks.

They each measure 1500 X 220 X 80 with a solid, 15mm thick base for the mounding of semiconductors. The amplifier will stand as shown in the photo (like a tower) with the heatsinks forming the left and right side panels. This way the amp will take up very little floor space.

Iíll probably get back to this thread with circuit details in a week or so.

Cheers,
Glen

Click the image to open in full size.
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Old 27th June 2007, 10:30 AM   #2
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You`re crazy!
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Old 27th June 2007, 10:35 AM   #3
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Is this "Class A+" technique the one where a low power class-a amp is has it's ground swung by a high power class-b amp?
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Old 27th June 2007, 11:22 AM   #4
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Quote:
Originally posted by richie00boy
Is this "Class A+" technique the one where a low power class-a amp is has it's ground swung by a high power class-b amp?

Yep.
I'm using a class AB amp though.
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Old 27th June 2007, 12:04 PM   #5
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I feared it was... the design is not class-a at all and merely a waste of resources - it will only ever be as good as the class-ab ground swinging amp.
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Old 27th June 2007, 12:13 PM   #6
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Quote:
Originally posted by richie00boy
I feared it was... the design is not class-a at all and merely a waste of resources - it will only ever be as good as the class-ab ground swinging amp.


Admit it: you're just jealous of those heatsinks

The pseudo-class A Technics amps never sounded as good to me as a nice class AB...Nothing to do with real class A.
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Old 27th June 2007, 12:15 PM   #7
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Those heatsinks are mighty big but I have doubts about their efficiency in the configuration you planned: See the vertically oriented fins loose their efficiency if they are too high since the air warms up in the "early stages" and convenction can't cool the rest of the sink. Are you going to make somekind of forced cooling scheme to that thing as well?

Anyway, seems like an interesting project and I can imagine that the amplifier "column" will look pretty awesome.
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Old 27th June 2007, 12:47 PM   #8
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Hm, do Class D on those sinks. Megawatts.... mmmmmmm
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Old 27th June 2007, 02:54 PM   #9
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Oh man! Where dya get the heatsinks from? Paramount Browns?

I like crazy.....
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Old 28th June 2007, 01:22 AM   #10
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Quote:
Originally posted by richie00boy
I feared it was... the design is not class-a at all and merely a waste of resources - it will only ever be as good as the class-ab ground swinging amp.

LOL!
I'm sorry, but that is just baloney. The design is 100% class A. Perhaps you are confusing it with something else.

Anyone interested enough in learning more can read up on it by obtaining the reference here:

http://www.diyaudio.com/forums/showt...67#post1237267



Quote:
Originally posted by analog_sa




Admit it: you're just jealous of those heatsinks

The pseudo-class A Technics amps never sounded as good to me as a nice class AB...Nothing to do with real class A.


The "Class A+" amplifier is NOT "pseudo-class A". It is class A with tracking rails.


Quote:
Originally posted by quasi
Oh man! Where dya get the heatsinks from? Paramount Browns?

I like crazy.....

http://www.fastron.com.au/
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