EQUIPMENT HISTORY:
Everything I am describing below is IMPORTANT, read it please!
This amplifier is part of my “collection” of all things audio, both professional and consumer gear. I personally don’t mind a decent NAD piece of gear and this particular unit was a “to be looked at” as it is NOT WORKING – see the FULL details below.
These 3140 amplifiers are often praised for their audio qualities and the ability to handle “peaks” with a dynamic range that often surprises many. They use a design which results in an amplifier that easily produces far greater audio output than the listener could be expecting.
This amplifier is designed to supply 40W Audio power (RMS) per channel into a “normal” 8 Ohm loudspeaker system but on loud passages/peaks, this amplifier easily delivers 80W output on each channel – the idea being that when listening to music with a wide (demanding) dynamic range, this amplifier will sound great no matter if the audio is of a low level or suddenly jumps up in level considerably, the 3140 takes it all in its stride. Other amplifiers, when pushed hard, will spit the dummy and sound absolutely horrible (distortion).
I have over the years collected together a LOT of quality audio equipment due to my business activities in pro audio post production and general electronics but the day has finally arrived when it must be shown the door!
My wife says (quite rightly) “for goodness sake, get rid of that mountain of gear” so them’s my orders … out goes all the equipment.
This NAD 3140 does have issues, and it is extremely important that the complete description is read in full.

THE CONDITION OF THIS EQUIPMENT IS CLEARLY STATED BELOW, BOTH COSMETICALLY AND ELECTRICALLY

There is no warranty, there are no returns – but I am very thorough in my descriptions and do not “gloss over” any issues I might discover!

Even if the new owner doesn’t feel up to repairing or having this equipment restored, it is still a great source of some very hard to find parts – a component “farm”.

NAD 3140 Stereo Amplifier
Model: 3140
Made in Taiwan
Serial # 3425108
Released to market 1988~1989
Frequency response: 20Hz ~ 35Khz
Power Output (8 Ohm) 40W RMS per channel or 80W RMS per channel 4 Ohm
+3 dB of dynamic headroom is available, which means the 3140 is capable of delivering over 80 watts per channel (8 ohms)
THD (at full power): 0.02%
Damping Factor: 50
Signal/Noise Ratio: Phono 76dB Aux 95dB
Inputs provided:
2x PHONO
Phono 1 has a fixed input impedance 47K/100pF
Phono 2 has a user selectable input capacitance (100/200/320pF)
Both Phono inputs are designed for commonly used MM cartridges (Moving Magnet) and there is NO user switch for MC cartridges (unlike other NAD amplifiers)
TUNER
AUX
2x TAPE
Dual speaker outputs (A & B)
The power amplifier has 2 different inputs, to which you can connect the Preamp output directly or via external audio processing equipment
Power amplifier input LAB is wide band and quite specialised in that it is designed for use when undertaking laboratory test measurements
Power amplifier input NORMAL has some “out of audio band” filtering to reduce the possibility of intermodulation distortion.

FRONT PANEL:
Speaker select: A,B,OFF or A+B
Bass
Treble
Speaker EQ (User selectable 45 or 70Hz 12dB BOOST!)
SPECIAL NOTE: This speaker EQ can be useful if your system uses long-throw woofers (generally larger than 8″ diameter) but BEWARE if using this feature on smaller loudspeaker systems, it is easy to overdrive the woofers in particular – read the User Manual about this.
Mono (ON or OFF)
Tape Monitor (ON or OFF)
Input select switch
Loudness (ON or OFF)
Volume & Balance (Concentric control)
LED’s indicate POWER ON & SOFT CLIPPING & SLC
SLC is a circuit designed to compensate for excessive resistance in your speaker leads i.e using loudspeaker cable with thin conductors.

Dimensions: 420 x 110 x 320mm
Weight: