Sugden A28 II schématic ? - diyAudio
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Old 16th October 2008, 03:37 PM   #1
v6us is offline v6us  France
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Default Sugden A28 II schématic ?

Hello,

I search the Sugden A28 II schematic for repair this one.

Thanks.

Hervé.
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Old 16th October 2008, 06:54 PM   #2
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Default Here you may have the one you want


Ill y a beaucoup de esquematique.

http://www.audiomisc.co.uk/JES/Si402/Si402.html

à bientôt

Carlos
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Old 17th October 2008, 02:00 PM   #3
v6us is offline v6us  France
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Hello destroyer X,

Thanks you for this very interessant links. But there is no A28 II schematic.

Hervé.
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Old 17th October 2008, 06:43 PM   #4
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Default I am sorry Hervê... into my imagination you would find it there


Sorry for that.

au revoìr.

Carlos
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Old 17th October 2008, 06:55 PM   #5
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what's difference between A25 and A28 ?

I have schematic of A25 , from some frenchy forum ; it's in fact , plain OP based preamp , and output amp literally replicated from Hitachi CookBook for mosfet amps , all away from 2SK135/2SJ50 era .
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Old 17th October 2008, 10:07 PM   #6
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The A25 used AOP and the A28 II only discret component.
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Old 18th October 2008, 07:50 AM   #7
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Default A25 output

that's all I have ;
I can't remember where I got it , except that is form some french forum
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Old 18th October 2008, 02:50 PM   #8
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Hello,

I have resolved my problem. It's was just two soldering dry out on the balance potentiometer.

thank you very much for your responses.

hervé.
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Old 5th March 2009, 09:32 PM   #9
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Ah, the A28II! Always worth fixing if you ask me. I have owned many integrated amps over the years including a few that cost quite a bit more than the A28II but I have yet to find one I enjoy more. Listening to it right now as a matter of fact, 23 years of ownership and still no fatigue on my part
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Old 5th July 2009, 09:29 AM   #10
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Hi all

I 've just got an A28II. There is a minor problem that the bias current of the R chanel is higher than the left chanel. I measured the voltage across the power resistor near the output transistors and adjust the pot to reduce the bias current of right channel to be equal left channel but not sure if this is correct setting. The heat sink is only slighly warm, clearly not much in class A.

Can anyone help me with this? I would appreciate if any of you can email me the schematic (quan_ta at yahoo dot com).

thanks
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