Audiolab 8000A fault in power amp side - HELP! - Page 2

Netlist · 25th April 2006, 09:57 AM

The only thing I can come up with is to solder wires directly to the PCB at the power amp in.
Can you post some pictures of the sockets? Inside and outside view as well as PCB traces.

/Hugo

richie00boy · 25th April 2006, 10:30 AM

When you ran the amp as a full integrated, did you have any kind of link from pre-out to power-in, or did it just work with no links/connections? I suspect there is an internal link between these two parts that needs to be broken. It sounds as though the pre-out is loading down whatever you insert into the power-in.

carribey · 25th April 2006, 11:27 AM

Yes, when it was run as an integrated there are no extra links from the pre-out to the power in, I just simply put my sources into the rca connectors and ran the speakers out of their out puts.

The RCA connectors for the 'Pre Amp In' and 'Power Amp Out' sit next to each at the rear of the unit. I shall just go an get my camera and post some pictures of the outside rear of the 8000a and the circuit board inside. Will be 10 mins or so.

John

carribey · 25th April 2006, 11:49 AM

Good news, I finally got through to Audiolab and they told me what has to be done.

Although they make it apparently easy to use the 8000A as a pre or a power amp, it's not so simple as just plugging in the RCA's at the rear.

Instead I have to unsolder Resistors R979/980 and move them across to empty places on the PCB R985/986. Audiolab support explained that this used to be done by dealers, hence why it is not so user friendly to owners.

I'll do this in the next couple of hours, if it works I'll post to let people know.

Thanks for the help,

John

carribey · 25th April 2006, 12:47 PM

Just done the soldering, works perfectly now!
Thanks for all your help,
John

Netlist · 25th April 2006, 01:02 PM

Well, speaking of a tricky problem.

/Hugo

sreten · 25th April 2006, 01:09 PM

Hi,

for those that may be confused :

The 8000A has pre-amp out sockets that work. It has power amplifier in sockets
that do not work. This is because the power amplifier is internally connected
to the pre-amp out, so you do not need to externally connect the two together.

This arrangement frees up the pre-amp out sockets, which can be used to drive
another power amplifier for bi-amping, or used as a line level input to an active
subwoofer.

To use the power amplifier in sockets the amp needs internal rewiring.

/sreten.

Netlist · 25th April 2006, 06:23 PM

Thanks a lot for clarifying, sreten.

/Hugo

25th April 2006, 10:30 AM	#12
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	When you ran the amp as a full integrated, did you have any kind of link from pre-out to power-in, or did it just work with no links/connections? I suspect there is an internal link between these two parts that needs to be broken. It sounds as though the pre-out is loading down whatever you insert into the power-in. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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25th April 2006, 09:57 AM	#11
Netlist diyAudio Moderator Join Date: Jan 2003	The only thing I can come up with is to solder wires directly to the PCB at the power amp in. Can you post some pictures of the sockets? Inside and outside view as well as PCB traces. /Hugo

25th April 2006, 11:27 AM	#13
carribey diyAudio Member Join Date: Apr 2006 Location: London	Yes, when it was run as an integrated there are no extra links from the pre-out to the power in, I just simply put my sources into the rca connectors and ran the speakers out of their out puts. The RCA connectors for the 'Pre Amp In' and 'Power Amp Out' sit next to each at the rear of the unit. I shall just go an get my camera and post some pictures of the outside rear of the 8000a and the circuit board inside. Will be 10 mins or so. John

25th April 2006, 11:49 AM	#14
carribey diyAudio Member Join Date: Apr 2006 Location: London	Good news, I finally got through to Audiolab and they told me what has to be done. Although they make it apparently easy to use the 8000A as a pre or a power amp, it's not so simple as just plugging in the RCA's at the rear. Instead I have to unsolder Resistors R979/980 and move them across to empty places on the PCB R985/986. Audiolab support explained that this used to be done by dealers, hence why it is not so user friendly to owners. I'll do this in the next couple of hours, if it works I'll post to let people know. Thanks for the help, John

25th April 2006, 12:47 PM	#15
carribey diyAudio Member Join Date: Apr 2006 Location: London	Just done the soldering, works perfectly now! Thanks for all your help, John

25th April 2006, 01:02 PM	#16
Netlist diyAudio Moderator Join Date: Jan 2003	Well, speaking of a tricky problem. /Hugo

25th April 2006, 01:09 PM	#17
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, for those that may be confused : The 8000A has pre-amp out sockets that work. It has power amplifier in sockets that do not work. This is because the power amplifier is internally connected to the pre-amp out, so you do not need to externally connect the two together. This arrangement frees up the pre-amp out sockets, which can be used to drive another power amplifier for bi-amping, or used as a line level input to an active subwoofer. To use the power amplifier in sockets the amp needs internal rewiring. /sreten.

25th April 2006, 06:23 PM	#18
Netlist diyAudio Moderator Join Date: Jan 2003	Thanks a lot for clarifying, sreten. /Hugo

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