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Help! Audiolab 8000A
Help! Audiolab 8000A
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Old 25th July 2005, 03:09 PM   #1
Matthewong is offline Matthewong  Malaysia
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Default Help! Audiolab 8000A

I've an Audiolab 8000A integrated amplifier, but recently the amplifer spoiled. I sent to a lot of shop to repair, but none can repair it, does anyone out there got the 8000A schematic diagram? Thanks
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Old 25th July 2005, 06:37 PM   #2
Allexx is offline Allexx  Ukraine
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Here it is. Let me know what the problem is.
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Old 27th July 2005, 03:10 PM   #3
Matthewong is offline Matthewong  Malaysia
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Thanks a lot, the problem is one side transistors burned. And until now also can't fix it, hope the schematic diagram will help me. I've refered to your schematic and found out it didn't match my Audiolab 8000A. My amp is the vey old model, it used 4 transistor per channel and yours schematic only using 2 output transistors per channel.
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Old 27th July 2005, 04:00 PM   #4
Leolabs is offline Leolabs  Malaysia
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U can try to send to me Ha ha,just kiding I suggest that u should measure the supply voltage first.
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Old 27th July 2005, 05:11 PM   #5
Matthewong is offline Matthewong  Malaysia
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Just now I've checked every thing and found one transistor spoiled, I've changed it and it works. But when I connected it to my 'scope' , One channel signal can't go loud enough, when i turn the volume up, it will be protected. Don't know wheter I used wrong transistor or not.
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Old 2nd August 2005, 08:35 AM   #6
dudu is offline dudu  Israel
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Default fix an amplifeir

To fix any amp' - the power circuit - Don't conect to 220/110VAC . use double power supply with two Ampers VU and conect it to the big capasitors ( +,0,- )
Afer u finish to change the all damage semiconductors and parts.
turn on to +,- 15VDC and see if the current go up ( 1-2A )

If it is - U don't finish to find the all damage parts of the circuit !( maybe some resistor/s is/are open - u can't see it in u'r eyes - u have to check it by FLUKE or any multimeter) .So turn on to + ,- 45VDC.

If it isn't - check 0/0.1VDC on the mid lages of the white double resistors ( 0.22 ohm X 2 ) . If it is , conect the AUDILAB 8000A to the 220/110VAC - IT WILL BE WORKINK !

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Old 23rd November 2006, 11:28 AM   #7
davephot is offline davephot  United Kingdom
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Default shorted audiolab

Hi matthewong, i have a broken audiolab 8000a the amp shorted due to the speaker wires touching, i got my amp when it first came out, it as got din sockets instead of phono's, i have got a schematic but it does not match mine, i see that you have got a early audiolab, did you manage to get a schmatic for it if so would it be possable for me to have a copy please, also if you had the same kind of problem as me and have fixed yours any tips would be greatly welcome thanks, i hope you can help in any way as this amp has been with me i long time and i have no desire to get antother one if this is fixable.

Thanks dave.
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Old 22nd September 2007, 06:26 PM   #8
audio_man2007 is offline audio_man2007  United Kingdom
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Question Audiolab 8000A old model

Hello folks,

I two have a original model 8000A in need of repair, it has the original AL8AN & AL8AP devices in the ops. Its the one with the DIN sockets.

I have replaced the devices in the right channel with BD 911/BD912's.
The left channel seems to be original.

Also the caps in the psu don't have a value on them, are they 10000uF caps?

I think the originals were semelab devices SM 2178? relabeled?

Has anyone else seen this?
Can anyone help with a schematic for this model?
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Old 25th September 2007, 05:41 AM   #9
Matthewong is offline Matthewong  Malaysia
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Actually i got the schematic but it is a newer version than your 8000A. Can you please tell me more about the problem that your 8000A is facing, maybe I can give you some advice.
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Old 15th October 2007, 07:09 PM   #10
Edumar is offline Edumar  Brazil
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Hello Friends,

Can someone help me?

I purchased an old Audiolab 8000A integrated amplifier (with DIN input/outputs).
It was manufactured by Cambridge Audio, for use in 220V.
I would like to use it in 115V.

It has a toroidal transformer with 3 wires input, and one of them (a brown wire) is disconnected. Then, only two wires are being used.
Do you have an idea if it can be used in 115V, and if this wire of the transformer is used with this option?

Does anybody here have a schematic diagram of this amplifier?

Thank you very much

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