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Nad 3240pe
Nad 3240pe
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Old 28th July 2003, 03:30 PM   #1
tonitze is offline tonitze  Singapore
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Default Nad 3240pe

Has anybody the schematic of Nad 3240pe. I need it to repair the faulty output stage of the amp.


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Old 30th July 2003, 03:49 AM   #2
yeshu26 is offline yeshu26  United Kingdom
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Default 3240 PE unstable


I dont have schematic for this amp, but let me tell u onething. This amp is one piece of $$it!! if ur o/p stage keeps blowing up, I doubht it will be alright again.

I changed all the comps!! all the comps!! but no difference.

D 669, bf 469 transistors used in driver stages r no obsolete, what u get is duplicate chinese stuff! unreliable.

My suggestion would be to get away with it.
yes I am pessimistic

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Old 26th January 2005, 10:48 AM   #3
entsetzen is offline entsetzen  New Zealand
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I also have a NAD 3240PE and I believe my output stage keeps on blowing fuses when I turn it on, are there any schematics for this amp so I can fix it?
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Old 18th February 2014, 09:45 AM   #4
tiefbassuebertr is offline tiefbassuebertr  Germany
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Originally Posted by tonitze View Post
Has anybody the schematic of Nad 3240pe. I need it to repair the faulty output stage of the amp.


Schematic you will get there as PDF for free, but in bad resolution:
NAD 3240PE SCH Service Manual free download, schematics, eeprom, repair info for electronics
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Old 18th February 2014, 07:12 PM   #5
ilimzn is offline ilimzn  Croatia
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Changing semiconductors today is a risky business unless you are sure they are not counterfeit - especially 'blanket change' - you may well end up with an amp in a worse state than before.
With these amps it is crucial to get the Power Envelope circuits working right, otherwise they will be permanently dtuck on the high supply voltage and yes they WILL blow outputs as they will easily go out of sustainable SOA limits. When an output blows, they often end up destroying the switch transistor for the PE circuit, and it goes short - therefore locking the amp at a way too high supply voltage for the single pair of output transistors it has.
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Old 18th February 2014, 07:30 PM   #6
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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This one is a little clearer;
Download the NAD 3240-PE service manual for free - Hifi Manuals
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
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