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Old 7th October 2012, 02:32 PM   #11
Vostro is offline Vostro  South Africa
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They got to a theoretical Ppk = V*V/R ; (40*40) / 4 = 400W.

But ofcourse this is a lie and can never each this.

With lots of luck 65W rms into 8R.

I'm also scared 3*Vdiode + 47R will bias drivers to hard.

Last edited by Vostro; 7th October 2012 at 02:38 PM.
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Old 7th October 2012, 04:01 PM   #12
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Quote:
Originally Posted by djk View Post
That amplifier will be about 60W/8Ω on a typical 40V supply.

Whoever labeled it 400W was demented/on drugs, etc.
Hi djk,
Sadly the 400W label really can fool beginner like me few years ago, of course when I'm not an diyAudio member yet. This time quite hard to explain to other people around me "Hey this only labelled 400W, if this kit you powering with 32VAC from trafo you can not have that much power" something like that.
But the one I telling not believe me, they choose to believe the label & the Sanken is 200W device then it is easy to say this circuit can deliver 400W
It is use 4 x 200W device...bla...bla...bla...

Quote:
Originally Posted by Vostro View Post
They got to a theoretical Ppk = V*V/R ; (40*40) / 4 = 400W.

But ofcourse this is a lie and can never each this.

With lots of luck 65W rms into 8R.

I'm also scared 3*Vdiode + 47R will bias drivers to hard.
Hi Vostro,
I'm also afraid of those 3 diode, many people (here where I live) change the component a bit & powering up to 40VAC & Click the image to open in full size. Click the image to open in full size. get some luck the amp just work fine...
The funny thing is I don't know how to do that
This circuit is quite available here where I am, sales as a kit & labelled 400W(1 pair output) or 1200W(2 pair output) how do you think

Ok, then maybe better just use another design.
Tons of good design here @diyAudio waiting to be build

Thanks
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Last edited by JOHN BALI; 7th October 2012 at 04:12 PM. Reason: add few funny words
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Old 7th October 2012, 04:26 PM   #13
naf is offline naf  Indonesia
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Quote:
Originally Posted by JOHN BALI View Post
Hi djk,
Sadly the 400W label really can fool beginner like me few years ago, of course when I'm not an diyAudio member yet. This time quite hard to explain to other people around me "Hey this only labelled 400W, if this kit you powering with 32VAC from trafo you can not have that much power" something like that.
But the one I telling not believe me, they choose to believe the label & the Sanken is 200W device then it is easy to say this circuit can deliver 400W
It is use 4 x 200W device...bla...bla...bla...


Hi Vostro,
I'm also afraid of those 3 diode, many people (here where I live) change the component a bit & powering up to 40VAC & Click the image to open in full size. Click the image to open in full size. get some luck the amp just work fine...
The funny thing is I don't know how to do that
This circuit is quite available here where I am, sales as a kit & labelled 400W(1 pair output) or 1200W(2 pair output) how do you think

Ok, then maybe better just use another design.
Tons of good design here @diyAudio waiting to be build

Thanks
, right decision John Bali.. tons of good design amp to choose here!
ranging from class A~H...
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Old 8th October 2012, 06:07 PM   #14
Riff is offline Riff  Indonesia
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Quote:
Originally Posted by JOHN BALI View Post
Hi djk,
Sadly the 400W label really can fool beginner like me few years ago, of course when I'm not an diyAudio member yet. This time quite hard to explain to other people around me "Hey this only labelled 400W, if this kit you powering with 32VAC from trafo you can not have that much power" something like that.
But the one I telling not believe me, they choose to believe the label & the Sanken is 200W device then it is easy to say this circuit can deliver 400W
It is use 4 x 200W device...bla...bla...bla...


Hi Vostro,
I'm also afraid of those 3 diode, many people (here where I live) change the component a bit & powering up to 40VAC & Click the image to open in full size. Click the image to open in full size. get some luck the amp just work fine...
The funny thing is I don't know how to do that
This circuit is quite available here where I am, sales as a kit & labelled 400W(1 pair output) or 1200W(2 pair output) how do you think

Ok, then maybe better just use another design.
Tons of good design here @diyAudio waiting to be build

Thanks
hi bli jhon...i agree
but the question is whether the above topology really can not produce at least a 400watt?
this is about topology,maybe with part replacement.
how about "tef"... can be applied to the above scheme?
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Old 8th October 2012, 08:09 PM   #15
djk is offline djk
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"this is about topology,maybe with part replacement."

Sure, all that is needed is to change every transistor type number and every other part value, add more outputs, etc. (easy).

I used to change everything on the Pass A40 board and made a 600W class AB amplifier , rather than the 40W class A amplifier the board was designed for.
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Last edited by djk; 8th October 2012 at 08:20 PM.
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