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NAD 3240PE

Stereo Integrated Amplifier (1988-89)

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NAD 3240PE

Specifications

Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.03%

Damping factor: 50

Input sensitivity: 3.5mV (MM), 160mV (line)

Signal to noise ratio: 76dB (MM), 102dB (line)

Dimensions: 420 x 108 x 380mm

Weight: 6.7kg

Year: 1989

Price: GBP £199 (1989)

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Reviews

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rating
Reviewed Jun 10th, 2017 by aigo

Bought mine two decades ago as used, did not know what to do with it till now. This little thing has good musicality, especially for classical and jazz. It is like found again, absolutely love it!

rating
Reviewed May 07th, 2016 by kjs73

Excellent sound quality

rating
Reviewed Jul 16th, 2014 by Rizal

Audiophile amp with small budget

 

Comments

re: 3240PE

Schematics are for the most part un-useable is there an amp with similar output/driver stages that may be more readable??

The faults of this unit are in the stage prior to the Main in/ pre-out socket but after the volume control. When left ch is used as input and the unit is in mono mode both outputs have fault. input sine-wave, output Neg going pulses 20% duty cycle.
It acts like the driver stage has a supply resistor gone high. When I figure it out I will add new comment.

re: 3240PE

Hi from near Milan,Italy
I've just repaired a broken NAD PE3240 found in a garage sale for 5 euro.
The amp was almost completely silent,connecting a source resulted in a weak but almost undirstoted signal on outputs,furthermore,switching from Tuner to Phono revealed a strong "click",that tipical sound that you get connecting an audio input to a DC via a capacitor.It was due to the connection to the phono-pre double op-amp, a JRC NJM2043D,wich outputs were almost clamped to positive supply pin 8,because of lack of negative supply on pin 4.

The schematic,was readable enough to show that the regulated DC for op amps comes from Q501-Q502,the latter is for negative supply.It's base,normaly tied at -20v by D503, was shortened to ground by a damaged C516,47uF,25V.

I don't know if this could be useful in your case,because the fault i've found looks randomatic.I dont'know any reason why this capacitor should be stressed more than other components.
Anyway i want to share this experience,hoping it could be useful in other cases.
Good luck
Diego

bmork's picture

re: 3240PE

You rock! Thanks for the extremely helpful hints.

My wifes 3240PE, which she bought new and has owned for almost 30 years, did not sound quite "right" after being kept in storage for a few years. The symptoms were weak and slightly distorted sound. You could hear there was something wrong, and you had to turn up the volume much more than reasonable. It wasn't completely dead, but it was of course usable as an amplifier. We were about to replace it when I got the bright idea to google a bit and found this discussion.

Encouraged by your success, and my usual optimism, I opened it up and started measuring capacitors. Didn't bother to do any thinking, as I don't understand much of amplifier design anyway :-)

But after a while it became clear that this strategy would take a bit more time than I had anticipated. So I impatiently started replacing a few suspects without reason. Mostly the 47uF,25V ones since that had obviously been a success before and I had a few of those lying around. But this got me nowhere. So I measured a few other capacitors, and got a hit! C311 (100uF,25V) was shorted. Replaced it and what do you know? That was it.

As I still don't understand much about amplifiers, or bother to learn, I cannot exlain how it caused the symptoms. But it definitely did. The amp is working like new now. Hopefully for another 30 years :-)

re: 3240PE

Hallo
.Can you help me with a scematic drawing of NAD Stereo amplifier 3240PE with the wire colours and voltages please

NAD 3240PE Trouble Shoot

Hi all,

I have brought my 3240 out of storage and found the base response is "fuzzy" and distorted as the volume increases. Anyone with an idea of the issue or had a similar problem?

BT

Capacitors

Taking into account the age of the unit, the first thing I'd do is open it up and check for leaking/bulging electrolytic capacitors.

Regards,
JaS

NAD3240PE

THANKS!

Isidore Cat's picture

NAD 3240pe

Thank you very much...

NAD 3240PE

Hi there, im needing a circuit diagram for the NAD 3240PE. Found a few online but not really legiable.

Please assist

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