I repaired a friends NAD amp about 10 years ago from memory. Can't remember the model number but it was about 120W per channel and had one channel completely blown up. It was a semiconductor grave yard. To cut a long story short, it was caused by dry solder joints on the transformer PCB which ran down the centre of the chassis. From memory it was quite a chore to remove the transformer and PCB as an assembly but once done the fault was glaringly obvious. The soldering from the factory was very poor. Once soldered correctly all ills disappeared, that is after replacing all the dead semis. It even blew up the speaker protection relay driver IC. In short, check everywhere for poor soldering or it may come back to bite you.
A few positives about the 3240pe: DC offset was almost zero after 22 years... On both channels, and those cheap looking pots to adjust bias and DC offset actually work very good and smooth.
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