NAD Stereo Amplifier 10 20 B User Manual

10 20 B Stereo Preamplifier  
Date of manufacture : Jan 85 - Jan 87  
Please note that this document contains the text from the original product brochure, and some technical statements may now be out of date  
The NAD 1020B continues the NAD tradition of remarkable price/performance value. An audiophile-quality  
preamplifier at an extraordinarily low price, the NAD 1020B is derived from the design of the pre-amp section in the  
renowned NAD 3020B integrated amplifier. It is the optimum choice for listeners who wish to combine the  
simplicity and acclaimed performance of the 3020B with a much larger power amplifier, a bi-amplified system, or  
active powered loudspeakers. The surprisingly low price of the NAD 1020B pre-amp, together with the modest cost  
of several “best buypower amplifiers in todays marketplace, substantially reduces the entry cost into high-  
performance separates for many audiophiles whose choice would otherwise be limited to integrated amplifiers and  
receivers. Do not be deceived by the 1020B’s external simplicity and bargain cost; this is not a compromise product,  
nor a halfway step toward high-quality sound. Its economy results from spartan cosmetics, canny engineering,,  
efficient manufacturing, modest input/output flexibility, and the elimination of seldom- used features. Behind its  
modest faceplate the 1020B’s circuitry-and its sonic performance-are the equal of most preamplifiers costing two or  
three times more, Circuit Features Wide-Range Phono Preamplifier. As long as phonograph records remain the  
primary high-quality music source for most listeners, the phono pre-amp stage will be the heart of any good  
preamplifier-its most important circuit and potentially its weakest link.  
Instead of the usual low-cost IC, the phono preamplifier section of the 1020B is a newly designed discrete-transistor  
circuit whose performance matches that of far more expensive pre-amp systems: 0 It interfaces correctly with the  
high impedance of the moving-magnet pickup cartridge (as many costlier preamplifiers do not), avoiding complex  
impedance interactions that can alter the pickups frequency response.  
Its input capacitance is switch-selectable, allowing you to provide the loading that the cartridge needs for flattest  
response.  
• its precise RIAA equalisation preserves the exact frequency response of your cartridge.  
Its signal to noise ratio is optimised, not for the usual short-circuit input, but for the typical impedance of real  
magnetic cartridges. As a result its residual circuit noise is close to the theoretical limit set by the cartridge itself  
(the “thermalnoise due to the pickups own impedance). This ensures that the preamps noise will be inaudible  
even when you are playing the widest-range direct-to-disc and digitally mastered discs.  
For low-output moving-coil cartridges a rear-panel switch resets the preamps parameters to provide the required  
20 dB of added gain with extremely low noise-lower than that of many external pre-preamplifiers, while  
avoiding the high cost and hum problems of step-up transformers.  
The circuits distortion remains extremely low, not only with simple sine-wave test tones but also when  
reproducing the most complex and demanding high-level waveforms that a cartridge can generate. The circuits  
output stage has ample headroom for the amplified musical waveform and also provides plenty of current to  
drive the reactive RIAA feed-back network without strain.  
The dynamic range of the phono stage, over 107 dB, is ample for the widest-range digitally mastered recordings.  
 
P RE-AM P SECTION  
Phono input  
Input impedance (R and C)  
Input sensitivity, 1kHz  
MM & MC 47k/ 100, 200 or 320pF  
MM 1.25mV ref. 0.5V  
MC 0.09mV  
Input overload at 20Hz / 1kHz / 20kHz  
20 / 200 / 1800mV  
Signal/Noise ratio (A-weighted with cartridge connected)  
MM 75dB ref. 5mV  
MC 72dB ref. 0.5mV  
MM ±0.5dB (20Hz - 20kHz)  
MC ±0.5dB (50Hz - 20kHz)  
RIAA response accuracy  
Line level inputs  
Input impedance (R and C)  
Input sensitivity ref. 0.5V  
Maximum input signal  
Signal/Noise ratio (A-weighted ref 0.5V)  
Frequency response  
20k/ 220pF  
80mV  
>25V  
94dB  
±0.5dB  
Line level outputs  
Output impedance  
Pre-amp 600Ω  
Tape Source Z + 1kΩ  
Phones 150Ω  
Pre-amp >15V  
Tape >10V  
Maximum output level  
Phones >5V into 600Ω  
>250mV into 8Ω  
Remote  
NAD Link  
No  
No  
P HYSICAL SP ECIFICATIONS  
Dimensions (W x H x D)  
Net weight  
Shipping weight  
Power consumption (120 ~ 240V, 50/60Hz)  
420 x 96 x 240mm  
3.7kg  
4.8kg  
5W  
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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