Sugden P128

Jagman801 · 7th January 2007, 10:47 PM

Hi,

Has anyone got a circuit diagram for a Sugden P128?...

Cheers.

AndrewT · 7th January 2007, 10:51 PM

yes,
Email me

AndrewT · 10th January 2007, 07:36 AM

>: Recipient address
rejected: Konto nieaktywne / Account disabled

try sending another Email address.

syl999 · 27th July 2007, 03:58 PM

Hi Jagman,

I am also interressed by the schematics, so could you post it ?

Thanks.

AndrewT · 28th July 2007, 11:30 AM

I presume neither of you searched for P128.

Here you are you lazy pair.
http://www.diyaudio.com/forums/showt...095#post844095

The two rail fuses are not F2A but are F4A.

The relay driver is not a transistor. It's a diac fired SCR, which repeatedly re-fires.

syl999 · 30th July 2007, 02:54 AM

Andrew,

Thanks for the schematic, I just bought a pair of P128 and I will use it with a Musical fidelity P172 preamp. I hope it will work fine.

Regards.

pdyn · 9th November 2008, 11:30 PM

Hello
I lived in USA. Now I live in Europe. I have Sugden p128. It works on 110V but I must change it to 230V. Is it possible? How can I do it?

AndrewT · 10th November 2008, 07:27 AM

Yes, conversion back to 220/230/240Vac is possible.
All the mains voltage taps are brought out to 8pins on the PCB.
Soldered links adjust the voltage.
This is one of the most comprehensive pair of EI transformers I have ever seen implemented on a domestic Audio amplifier.

But,
remember you have two primary windings in each transformer that must be wired in series and each winding has 4wire taps (0,110,115,120).
The two transformers must then be wired in parallel.

And add a plastic cover to the internal mains' fuses if it's been lost.

syl999 · 10th November 2008, 01:37 PM

Hello,
As you can see on the schematics (links bellow) you just have to connect the primary of the power tranformer in serial instead of paralallel.
The link : http://www.diyaudio.com/forums/showt...095#post844095
If you want more explanation, do not hesitate to ask ...

AndrewT · 10th November 2008, 03:59 PM

oops,
I'm past the forgetful stage.
There's no 115Vac tapping, only three connections to each primary winding.

7th January 2007, 10:47 PM	#1
Jagman801 diyAudio Member Join Date: Jan 2007	Sugden P128 Hi, Has anyone got a circuit diagram for a Sugden P128?... Cheers.

7th January 2007, 10:51 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	yes, Email me __________________ regards Andrew T.

10th January 2007, 07:36 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	schematic >: Recipient address rejected: Konto nieaktywne / Account disabled try sending another Email address. __________________ regards Andrew T.

28th July 2007, 11:30 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I presume neither of you searched for P128. Here you are you lazy pair. http://www.diyaudio.com/forums/showt...095#post844095 The two rail fuses are not F2A but are F4A. The relay driver is not a transistor. It's a diac fired SCR, which repeatedly re-fires. __________________ regards Andrew T.

9th November 2008, 11:30 PM	#7
pdyn diyAudio Member Join Date: May 2008	110 to 230 V Hello I lived in USA. Now I live in Europe. I have Sugden p128. It works on 110V but I must change it to 230V. Is it possible? How can I do it?


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27th July 2007, 03:58 PM	#4
syl999 diyAudio Member Join Date: Jul 2007	Hi Jagman, I am also interressed by the schematics, so could you post it ? Thanks.

30th July 2007, 02:54 AM	#6
syl999 diyAudio Member Join Date: Jul 2007	Andrew, Thanks for the schematic, I just bought a pair of P128 and I will use it with a Musical fidelity P172 preamp. I hope it will work fine. Regards.

10th November 2008, 07:27 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Yes, conversion back to 220/230/240Vac is possible. All the mains voltage taps are brought out to 8pins on the PCB. Soldered links adjust the voltage. This is one of the most comprehensive pair of EI transformers I have ever seen implemented on a domestic Audio amplifier. But, remember you have two primary windings in each transformer that must be wired in series and each winding has 4wire taps (0,110,115,120). The two transformers must then be wired in parallel. And add a plastic cover to the internal mains' fuses if it's been lost. __________________ regards Andrew T.

10th November 2008, 01:37 PM	#9
syl999 diyAudio Member Join Date: Jul 2007	Hello, As you can see on the schematics (links bellow) you just have to connect the primary of the power tranformer in serial instead of paralallel. The link : http://www.diyaudio.com/forums/showt...095#post844095 If you want more explanation, do not hesitate to ask ...

10th November 2008, 03:59 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	oops, I'm past the forgetful stage. There's no 115Vac tapping, only three connections to each primary winding. __________________ regards Andrew T.

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