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Old 26th June 2012, 10:31 AM   #1
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Default audiolab 8000A ?

Click the image to open in full size.hi just got my hands on a audiolab 8000A it has a B in the serial number and the pcb number 27400.73 anyone know what year & version this amp is its very clean inside and out . i am running a pair of b&w CDM1 NT's speakers and the source is a cambridge audio 840c upsampling 24 bit cd player just wondering if i should change the cd or speakers ? or leave as it is . also the power caps is it wise to replace them with 15000uf caps and change the bridge rectifier with 4 single high current fast recovery diodes. what other caps are a whorthwile upgrade i dont use the phono stage.

Last edited by glennjarrett; 26th June 2012 at 11:27 AM.
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Old 26th June 2012, 11:51 AM   #2
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The 8000A was fundamentally a DC coupled amp so if it's working I would just be happy with it. They were built around the mid 80's.
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Last edited by KatieandDad; 26th June 2012 at 12:01 PM.
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Old 26th June 2012, 02:20 PM   #3
AndrewT is offline AndrewT  Scotland
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There are 4 signal diodes in the input LTP.
The top one mimics a current mirror.
The middle group of 3 look like some anti-saturation circuit.

Could some explain how this works?
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Old 26th June 2012, 03:38 PM   #4
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I do have the full 8000A Service Manual if anyone want it please PM me. It's a HUGE scanned book. Please ask Page by Page as most ISPs will block the entire scan.
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Last edited by KatieandDad; 26th June 2012 at 03:59 PM.
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Old 22nd October 2012, 03:53 PM   #5
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Default 8000a

hi i have a audiolab 8000a the mains transformer had blown the bridge rectifier had burned out and fuse blown . i have replaced the transformer and bridge rectifier and put a 100w light bulb in place of the fuse when i switch on the bulb glows then a few seconds later goes out . i have checked all four output 2x 2SC2922 & 2X 2SA1216 and driver transistors 2SA1668 & 2SC4382 out of circuit and all test ok any help please .
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