Sugden A21SE

Dobs · 16th July 2008, 06:42 AM

Hi,

Is someone can tell me what the two adjustment pots (one on each amplifier section (left/right)) are intended for?

Thanks

Mooly · 16th July 2008, 07:02 AM

Why ? Is this the new A21 SE (Current version).

Dobs · 16th July 2008, 07:45 AM

Yes the current A21SE

AndrewT · 16th July 2008, 08:30 AM

don't touch them.
Ask JES for a schematic.

Mooly · 16th July 2008, 01:21 PM

Is there a specific fault with it or are you just curious to know ?

Bonsai · 16th July 2008, 02:29 PM

Sugdens are really crap amps.

AndrewT · 16th July 2008, 03:06 PM

Quote:

Originally posted by Bonsai
Sugdens are really crap amps.

Can you use another descriptor, so that we can see what your opinion is?

Dobs · 16th July 2008, 03:34 PM

I suspect an adjustment to be needed on those 1k pot, because one side of the amplifier run hotter then the other. And there is a ceramic resistor close to the pot is running very hot, over 200 celsius unlike the other side wich is running at 170.

If i can find the value they should be set so i can see if they need to be adjusted or not would be great.

Thanks again

AndrewT · 16th July 2008, 03:40 PM

ask JES

Mooly · 16th July 2008, 04:27 PM

Perhaps it sets the quiescent current. Or perhaps not. It all depends on how experienced you are. The hotter one could be the correct one. They do run very very hot.
It's up to you !!! Would you know how to measure the quiescent current, or the output DC offset voltage so you could readjust it back again.
Just don't want you to damage it that's all. It may all be normal and within spec anyway.

16th July 2008, 06:42 AM	#1
Dobs diyAudio Member Join Date: Jul 2008	Sugden A21SE Hi, Is someone can tell me what the two adjustment pots (one on each amplifier section (left/right)) are intended for? Thanks

16th July 2008, 08:30 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	don't touch them. Ask JES for a schematic. __________________ regards Andrew T.

16th July 2008, 02:29 PM	#6
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Sugdens are really crap amps. __________________ bonsai http://www.hifisonix.com/

16th July 2008, 03:40 PM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	ask JES __________________ regards Andrew T.

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16th July 2008, 07:02 AM	#2
Mooly diyAudio Member Join Date: Sep 2007	Why ? Is this the new A21 SE (Current version).

16th July 2008, 07:45 AM	#3
Dobs diyAudio Member Join Date: Jul 2008	Yes the current A21SE

16th July 2008, 01:21 PM	#5
Mooly diyAudio Member Join Date: Sep 2007	Is there a specific fault with it or are you just curious to know ?

16th July 2008, 03:34 PM	#8
Dobs diyAudio Member Join Date: Jul 2008	I suspect an adjustment to be needed on those 1k pot, because one side of the amplifier run hotter then the other. And there is a ceramic resistor close to the pot is running very hot, over 200 celsius unlike the other side wich is running at 170. If i can find the value they should be set so i can see if they need to be adjusted or not would be great. Thanks again

16th July 2008, 04:27 PM	#10
Mooly diyAudio Member Join Date: Sep 2007	Perhaps it sets the quiescent current. Or perhaps not. It all depends on how experienced you are. The hotter one could be the correct one. They do run very very hot. It's up to you !!! Would you know how to measure the quiescent current, or the output DC offset voltage so you could readjust it back again. Just don't want you to damage it that's all. It may all be normal and within spec anyway.

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