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A501 / Z501 Luxkit Amplifier schematic
A501 / Z501 Luxkit Amplifier schematic
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Old 26th January 2013, 11:15 PM   #1
zlrig is offline zlrig
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Join Date: Apr 2010
Default A501 / Z501 Luxkit Amplifier schematic

I Am posting this schematic for the Luxkit A501 amplifier.
I believe the Z501 is the same, just a different market.
JB
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File Type: jpg A501.jpg (471.5 KB, 941 views)
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Old 18th June 2014, 04:28 PM   #2
Logicckjohn is offline Logicckjohn  Hong Kong
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Thanks a lot
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Old 7th April 2015, 05:49 PM   #3
tankertop is offline tankertop  United Kingdom
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Thanks from me too. Wonder if anybody has the original build instructions?
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Old 2nd December 2015, 04:36 AM   #4
zlrig is offline zlrig
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I do have them
big files though
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Old 5th April 2016, 09:43 AM   #5
fanchheiz is offline fanchheiz
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Hello,

thanks a lot, you save my amplifier's life!
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Old 24th July 2017, 02:00 AM   #6
Don Stewart is offline Don Stewart  Canada
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Location: Barrie, Ontario, Canada
Default A501 Luxkit DC POWER AMPLIFIER

Quote:
Originally Posted by zlrig View Post
I do have them
big files though

Any chance obtaining a download of the manuals for this unit.


I have a A501 which is working, except when run in the class A mode the idle temperature climbs to 140 degreesF within 1 minute and continues to rise. This seems excessive, I can feel the liquid boiling in the heat transfer tube at idle. I expect heat as with class A 70% power draw at idle but.....?


I'm wondering if just idle current adjustment is required, and it's falling into a thermal runaway scenario.....?


DC Balance always reads 0v across outputs and is stable, at minimum the correct adjustment procedure for the DC-Balance and the A-I (idle current) would be most appreciated. Also if possible the AB-I (idle current) adjustment could be checked and verified against what info you might have in the manual.
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Old 25th July 2017, 07:05 AM   #7
druidaudio is offline druidaudio  Wales
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Join Date: Feb 2009
Location: Wales UK
A501 / Z501 Luxkit Amplifier schematic
I have the service manual for the Z501.
You can download from http://https://www.hifiengine.com/manual_library/avance/z501.shtml
Or you can email me if you prefer? File is 7.3Mb
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Old 25th July 2017, 01:29 PM   #8
zlrig is offline zlrig
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Join Date: Apr 2010
Hi Don,
looks like DruidA posted a good link for you.
I have built two A501's (z501) and both will boil after switching to the A mode. It changes the output transistor bias. They never turn to the off as they are biased in a positive state.
The boiling sound is normal and at very low volume levels maybe a little annoying.
As to the actual temp they run at, I am not sure. Hot they run! I can measure it if you like and post it for you.
I would just verify your Offset and bias settings in both modes. If they cannot be obtained you have another issue.
let me know how you make out.
Jb
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Old 26th July 2017, 04:56 PM   #9
druidaudio is offline druidaudio  Wales
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A501 / Z501 Luxkit Amplifier schematic
As zlrig has said, check the bias and offset, mine doesn't run that hot.
Saying that, I realise that I have never checked my bias settings, only offset!
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Old 26th July 2017, 04:57 PM   #10
druidaudio is offline druidaudio  Wales
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Join Date: Feb 2009
Location: Wales UK
A501 / Z501 Luxkit Amplifier schematic
I also have quite a bit of info on the Z504 power amp if anyone needs it!
This is my everyday amp
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