NAD Stereo Receiver 7140 User Manual

7140 Stereo Receiver  
Date of manufacture : Jan 87 - Nov 89  
Please note that this document contains the text from the original product brochure, and some technical statements may now be out of date  
NAD is internationally recognised as the value leader in Hi-Fi, and the new 7140 stereo receiver provides  
an exceptional ratio of performance to price (even by NAD standards).  
The tuner section of the 7140 combines the convenience and accuracy of digital frequency-synthesis  
tuning with superior stereo sensitivity and quieting.  
The phono preamplifier, too, is audibly (and in some cases dramatically) quieter than many other preamp  
circuits, not only with moving-magnet pickups but also with low-output moving coil cartridges. The  
entire amplifier circuit has ample dynamic range for every program source, including the widest-range  
digital Compact Discs.  
The powerful high-current output stage of the 7140 drives loudspeakers to surprisingly high volume  
levels with clean, solid, full-bodied musical sound and a refreshing freedom from distortion, even in  
transient peaks. The exclusive NAD impedance selector allows you to make maximum use of the  
amplifiers power regardless of the true impedance of your speakers.  
The 7140 is conservatively rated at 40 watts/channel in the normal stereo mode, not only with test  
resistors but with loudspeakers of any impedance. Its 3 dB of IHF Dynamic Headroom means that it will  
deliver fully double its rated power (over 80 watts per channel) in brief bursts, important for undistorted  
reproduction of the uncompressed transients in Compact Discs and DBX-encoded recordings.  
Digital-ready design  
The receivers line-level inputs will not be overloaded by high-level signal peaks from a Compact Disc  
player or digital tape recorder. The 102 dB signal-to-noise ratio of the 7140 exceeds that of any  
analogue or digital program source. The low-impedance, low-noise design of the volume and tone  
control circuits guarantees that the transparent clarity of the finest analogue and digital recordings will  
be preserved.  
Low-noise MM/MC phono preamplifier  
The phono preamplifier in the 7140 is a discrete (non-IC) design featuring a matched pair of extremely  
low-noise transistors in a differential input circuit. It interfaces correctly with the impedance of magnetic  
cartridges, and a rear-panel MM/MC selector increases the circuit gain by 20 dB for low-output moving-  
coil pickups. The preamp has a push-pull output circuit, like a miniature power amplifier, that provides  
ample current to drive the precision RIAA equalisation network without slewing distortion, and its large  
dynamic range (107 dB) comfortably accommodates all digitally-mastered LP recordings with room to  
spare.  
As long as LPs remain a principal music source for many listeners, there must be no compromise in the  
quality of the phono preamp circuit.  
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PRE-AMP SECTION  
Phono input  
Input impedance (R and C)  
Input sensitivity, (1kHz, ref. rated power)  
Signal/Noise ratio (A-weighted with cartridge connected)  
THD (20Hz - 20kHz)  
47k/ 100pF  
3.2mV  
76dB ref. 5mV  
<0.04%  
RIAA response accuracy (20Hz - 20kHz)  
0.5dB  
Line level inputs  
Input impedance (R and C)  
Input sensitivity (ref. rated power)  
Maximum input signal  
Signal/Noise ratio (A-weighted ref 1W)  
Frequency response (20Hz - 20kHz)  
Infrasonic filter  
15k/ 100pF  
160mV  
>10V  
88dB  
0.5dB  
-3db at 15Hz, 24dB/octave  
0.01%  
THD  
Line level outputs  
Output impedance  
Pre-amp 600Ω  
Tape Source Z + 1kΩ  
Phones 220Ω  
12V  
Maximum output level  
Tape 8V  
Phones >10V into 600Ω  
>500mV into 8Ω  
Tone controls  
Treble  
Bass  
7dB at 10kHz  
10dB at 50Hz  
+3dB at 70Hz  
+6dB at 40Hz  
Bass EQ  
POWER AMP SECTION  
Continuous output power into 8*  
40W (16dBW)  
0.03%  
Rated distortion (THD 20Hz - 20kHz)  
Clipping power (maximum continuous power per channel)  
IHF Dynamic headroom at 8Ω  
50W  
+6dB  
IHF dynamic power (maximum short term power per channel)  
8160W (22dBW)  
4200W (23dBW)  
2250W (24dBW)  
>50  
Damping factor (ref. 8, 50Hz)  
Input impedance  
Input sensitivity (for rated power into 8)  
Frequency response  
22k/ 880pF  
1V  
6Hz - 50kHz +0, -3dB  
ref. 1W 100dB  
Signal/noise ratio  
ref. rated power 116dB  
<0.03%  
THD (20Hz - 20kHz)  
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FM TUNER SECTION  
Input sensitivity  
Mono -30dB THD+N 10.3dBf (1.8µV/300)  
Mono 30dB S/N 14.2dBf (2.8µV/300)  
Stereo 50dB S/N 36dBf (34µV/300) FM NR off  
29dBf (16µV/300) FM NR on  
Stereo 60dB S/N 46dBf (110µV/300) FM NR off  
40dBf (56µV/300) FM NR on  
Capture ratio (45 - 65dBf)  
AM rejection (45 - 65dBf)  
Selectivity, alternate channel  
Image rejection  
<1.5dB  
>60dB  
65dB  
70dB  
I F rejection  
Harmonic distortion  
90dB  
Mono 0.09%  
Stereo 0.09%  
Mono >80dB  
Stereo >75dB  
30Hz - 15kHz  
50dB  
Signal/Noise ratio  
Frequency response 0.5dB  
Channel separation at 1kHz  
AM TUNER SECTION  
Usable sensitivity  
Selectivity  
Image rejection  
I F rejection  
Signal/Noise ratio  
Harmonic distortion  
300µV  
35dB  
50dB  
35dB  
45dB  
0.5%  
Remote  
NAD Link  
No  
No  
PHYSICAL SPECIFICATIONS  
Dimensions (W x H x D)  
Net weight  
420 x 108 x 380mm  
7.5kg  
9.0kg  
Shipping weight  
Power consumption (120 ~ 240V, 50/60Hz)  
240VA  
* Minimum power per chnnel, 20Hz - 20kHz, both channels driven with no more than rated distiortion.  
Dimensions are of unit’s cabinet without attached feet; add up to 18mm for total height.  
Dimension depth excludes terminals, sockets, controls and buttons.  
© NAD Electronics. All rights reserved. E & OE  
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