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-   -   A501 / Z501 Luxkit Amplifier schematic (http://www.diyaudio.com/forums/solid-state/228721-a501-z501-luxkit-amplifier-schematic.html)

zlrig 26th January 2013 11:15 PM

A501 / Z501 Luxkit Amplifier schematic
 
1 Attachment(s)
I Am posting this schematic for the Luxkit A501 amplifier.
I believe the Z501 is the same, just a different market.
JB

Logicckjohn 18th June 2014 04:28 PM

Thanks a lot

tankertop 7th April 2015 05:49 PM

Thanks from me too. Wonder if anybody has the original build instructions?

zlrig 2nd December 2015 04:36 AM

I do have them
big files though

fanchheiz 5th April 2016 09:43 AM

Hello,

thanks a lot, you save my amplifier's life!

Don Stewart 24th July 2017 02:00 AM

A501 Luxkit DC POWER AMPLIFIER
 
Quote:

Originally Posted by zlrig (http://www.diyaudio.com/forums/solid-state/228721-a501-z501-luxkit-amplifier-schematic-post4534938.html#post4534938)
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.

druidaudio 25th July 2017 07:05 AM

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

zlrig 25th July 2017 01:29 PM

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

druidaudio 26th July 2017 04:56 PM

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!

druidaudio 26th July 2017 04:57 PM

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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