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Old 11th June 2008, 03:25 AM   #1
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Default interesting class A amp, 120w into 8ohms

hi,

i saw class A amp ZEN-XA, 120w into 8ohms. anyone knows about this amp?

how is your comment on this amp sound qulaity? is there anymore web can see this amp ppls build?



http://www.kk-pcb.com/zen-xa.html

thank you
michael
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Old 11th June 2008, 06:01 AM   #2
lineup is offline lineup  Sweden
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Default Re: interesting class A amp, 120w into 8ohms

Quote:
Originally posted by space2000
hi,
i saw class A amp ZEN-XA, 120w into 8ohms. anyone knows about this amp?
how is your comment on this amp sound quality?
is there anymore web can see this amp ppls build?
http://www.kk-pcb.com/zen-xa.html
thank you
michael
I say, you should have a look at what power supply you will need.
Also how much heatsinks?

Those 2 factors certainlyn will affect Sound Quality.

There are no 2 amplifiers, from same schematic, that is the same.
.. as there are no 2 transistors, or resistors, or transformers
or capcitors
... that are or can be 100 % same = perfectly match


regars
Lineup
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Old 11th June 2008, 06:01 AM   #3
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Default circuit diagram

here is the circuit diagram.




thank you

Click the image to open in full size.
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Old 11th June 2008, 06:24 AM   #4
Nordic is offline Nordic  South Africa
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In comparisson my wall mounted room heating pannel is only a bit over 200W
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Old 11th June 2008, 06:36 AM   #5
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hi,

what is the heat sink size require for this amp?

thank you
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Old 11th June 2008, 06:50 AM   #6
lineup is offline lineup  Sweden
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Quote:
Originally posted by space2000
hi,
what is the heat sink size require for this amp?

thank you

This is a Nelson Pass amplifier.
He would be the best man to ask.

Hope he reads this. I Know he will
Even if your topic should better be in 'Pass Labs' forum.

What I think is:
this is an Class A amplifier, with requirement Clean and powerful PSU.
And quite impessive heatsinking.

Lineup, me, and some other clever guys, usually put it like this:
Quote:
A power amplifier can never be better
.. than it's power supply ( PSU )
Make this test:
connect an amplifier, without power supply
to your speakers.

What do you hear?

The power comes from Power supply.
Amplifier can not make any power, at all.
Which many forget about.

If power supply is Strong & Good= amplifier can put out strong & good power.
If PSU not strong .. amplifier can not put out strong power.

Simple isn't it!!
Power supply sets the LIMIT for good and strong output power.
Not the amplifier.

Amplifier can be a good or less good Power handler. Serve some power.
But if power to handle is not there, amplifier can not do much.
=================


To make an analogy.
The cook makes the food. In the back of restuarante.
The waiter carry, handle, the food to the restuarant customer at the table.
If there is no good food to deliver, the waiter (amplifier) can not give the customer some good food.


Regars, Lineup
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Old 11th June 2008, 10:31 AM   #7
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Quote:
Originally posted by space2000
hi,

what is the heat sink size require for this amp?

thank you
Power dissipation?
Wanted temperature of the heatsink?
The room temperature?

If you know those parameters you can calculate have many deg C/W you'll need in the heatsink.
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Old 11th June 2008, 11:09 AM   #8
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I do not think this has Nelson's blessings. This company is making
money off these circute boards. I think this has been talked about
before this is not right to put it mildley. I am not positive this is a
Pass amp oh! the active Alph current source is stolen from Pas. But like this dude's Tube Zen amp it may not be a Pass amp -
This dude tacked a 6c33c on a zen Amp as an input buffer totaly
crazy!
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Old 11th June 2008, 12:22 PM   #9
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Quote:
Originally posted by peranders

Power dissipation?
Wanted temperature of the heatsink?
The room temperature?

If you know those parameters you can calculate have many deg C/W you'll need in the heatsink.

hi peranders,

Power dissipation? =500w (as i have seen on the circuit)

Wanted temperature of the heatsink? = means highest temp of the heat sink? if it is then should not be more then 45c after get hot.


The room temperature? =here is 28c




thank you for helping me.
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Old 11th June 2008, 01:04 PM   #10
Nordic is offline Nordic  South Africa
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45-28 = 17C Rise for 500W = 0.034C/W
and that is without package or issolator derating.....

IT IS HUUUUUUUUUUUUUUUUUUGE
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