Class A design question

JRace · 18th October 2008, 07:09 PM

I have been in contact with a designer of a new Class A amplifier, reported to do 300watts x2 into 4ohms.

The following response was given when asked "Is the amp 'pure' Class A or does it switch to Class B?

Quote:

We 100% follow the "A" design on first voltage stage and did a little be different on second current stage. Also add in a tube design method. So it is more like over 90% class "A" design.
The major different is to keep the amp cooling compare the pure "A" design and will save some current when the amp is not playing.

Something was lost in the translation I suppose...not to mention my ignorance

with amplifier design doesn't help!
Can anyone shed more light on what the designer meant?
I am attempting to gain more knowledge on Class A amplifier design.

Thanks,

JRace

astouffer · 18th October 2008, 09:10 PM

Sounds like the first stage is class A only. 300 watts x2 would need heatsinks the size of stove and probably a three phase supply.

lineup · 21st October 2008, 07:44 PM

it is a normal Class AB amplifier

if we call all amplifiers with an Input stage running Class A
for Class A
... then there is nothing but Class A around

false marketing = audio lie!

JRace · 21st October 2008, 08:12 PM

Interesting.

What are some pure Class A Amplifiers of high(er) power?

planet10 · 21st October 2008, 09:19 PM

Quote:

Originally posted by lineup
if we call all amplifiers with an Input stage running Class A
for Class A
... then there is nothing but Class A around

You beat me to that comment Halo (and tou said it much better than i would)

dave

PH · 21st October 2008, 09:56 PM

Look GRYPHON ANTHILEON SIGNATURE. It's 100kg beast which runs on 70 degrees, and I doubth it is all 150W in A...

jacco vermeulen · 21st October 2008, 10:52 PM

Solid state: Pass Labs XA200(.5)
Valve amps : Jadis JA200

CBS240 · 22nd October 2008, 12:05 PM

Quote:

Originally posted by astouffer
Sounds like the first stage is class A only. 300 watts x2 would need heatsinks the size of stove and probably a three phase supply.

It would be a stove. With over 1200W of power from the line, it would at least be like a toaster. Could be useful to you folks living up in the frozen North.

But without SMPS, you would need a dolly to move it around.

jacco vermeulen · 22nd October 2008, 03:29 PM

Quote:

Originally posted by CBS240
It would be a stove.

Like this golden oldy.

homemodder · 22nd October 2008, 03:47 PM

Wow two of those working class AB would be great for my listening room, but I guess I would be expelled from the neighbourhood.

21st October 2008, 07:44 PM	#3
lineup diyAudio Member Join Date: Dec 2005 Location: the north	it is a normal Class AB amplifier if we call all amplifiers with an Input stage running Class A for Class A ... then there is nothing but Class A around false marketing = audio lie! __________________ lineup

21st October 2008, 10:52 PM	#7
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Solid state: Pass Labs XA200(.5) Valve amps : Jadis JA200 __________________ Looks like Sponge Bob has killed another thread.

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18th October 2008, 09:10 PM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Sounds like the first stage is class A only. 300 watts x2 would need heatsinks the size of stove and probably a three phase supply.

21st October 2008, 08:12 PM	#4
JRace diyAudio Member Join Date: Jan 2006 Location: Vernon, BC	Interesting. What are some pure Class A Amplifiers of high(er) power?

21st October 2008, 09:56 PM	#6
PH diyAudio Member Join Date: Jan 2004 Location: SLOVENIA	Look GRYPHON ANTHILEON SIGNATURE. It's 100kg beast which runs on 70 degrees, and I doubth it is all 150W in A...

22nd October 2008, 03:47 PM	#10
homemodder diyAudio Member Join Date: May 2006	Wow two of those working class AB would be great for my listening room, but I guess I would be expelled from the neighbourhood.

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