NAD Stereo Receiver 7240PE User Manual

7240PE Stereo Receiver  
Date of manufacture : ? - 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note that this document contains the text from the original product brochure, and some technical statements may now be out of date  
The 7240PE receiver consists of the 3240PE integrated amplifier, with its vast reserves of clean, solid  
power for the the wide dynamic range of modern recordings, plus an exceptionally sensitive digital  
tuner.  
Power Envelope design  
While the 7240PE is rated at 40 watts/channel of steady-state power, its +6 dB of IHF dynamic  
headroom means that its dynamic power for musical transients exceeds 160 watts/channel at 8 ohms  
and 200 watts/channel at 4 or 2 ohms. Even with long 200-millisecond tone-bursts, representing the full  
duration of musical notes and chords, the 7240PE produces an impressive 100 watts per channel.  
High-current output stage  
The 7240PE de-livers up to 25 amperes per channel to ensure precise electromagnetic control of the  
speakers voice-coil, even with impedances as low as 2 ohms.  
Impedance selector  
This rear-panel switch lets you optimise the amplifier’? operation to drive either low impedances (2 to 6  
ohms) or a single set of speakers with a true 8-ohm (or higher) impedance.  
Soft Clipping™  
When the amplifier is driven beyond its rated power, NADs famous Soft Clip-ping™ M circuit gently  
limits the waveform and prevents the harshness that occurs in other receivers when the output  
transistors arc driven into saturation.  
Low-noise phono preamplifier  
NADs phono pre-amp circuits feature accurate RIAA equalisation, correct interfacing with the complex  
impedance of the phono cartridge, very low noise and plenty of headroom to accommodate the  
highest-level peaks without distortion.  
Digital-ready inputs  
With overload-proof line inputs and low-noise circuits for volume and tone control, the 724OPE  
accommodates a dynamic range greater than 100 dB, preserving the transparent clarity of the finest  
analogue and digital recordings.  
Bass EQ with infrasonic filtering  
The equalisation circuit boosts the deepest bass by 6 d B providing the sort of authentic bass “feel” that  
might otherwise require a costly separate subwoofer system. At the same time, a sharp infrasonic filter  
prevents excessive woofer-cone motion and minimises the bass-muddying effect of turntable rumble,  
warps and tone arm/stylus resonances.  
Musically Effective Tone Controls  
Ordinary bass and treble control circuits intrude on the midrange; boosting the bass, for instance, makes  
vocals thick and boomy. In NAD receivers, the bass and treble controls do what their names imply: they  
vary the strength of the bass (the solid foundation, the musical beat) and the treble (the crisp detail the  
airy brilliance) while preserving a neutral, accurate midrange response.  
 
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)  
© NAD Electronics. All rights reserved. E & OE  
 
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 units 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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