NAD Electronics 7020 User's Manual
Contents
1. 7020 Stereo Receiver Date of manufacture Jan 83 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note that this document contains the text from the original product brochure and some technical statements may now be out of date The NAD 7020 receiver is logically designed for optimum performance and ease of operation at an economical price An unusually high proportion of its cost is devoted to circuit engineering and electronic parts rather than to elaborate styling seldom used controls or esoteric features This results in a sound quality equal to many of the finest sepa rate audiophile components Every circuit in the 7020 is tested to deliver its full per formance in everyday use not just under controlled labora tory conditions Competing products may have similar power and THD ratings but in actual use the 7020 is typi cally easier to tune less prone to background noise with either FM or phono and when connected to the most de manding loudspeakers better able to reproduce the full impact and tonal richness of live music The 7020 receiver produces volume levels far greater than would be expected from its conservative 20 watt per channel power rating due to the high voltage high current output stage and unique Soft Clipping circuit Recent dramatic advances in FM tuner technology have been incorporated in the 7020 as well for especially high sensitivity wide stereo separation and low distortion STATE OF THE ART CIRCUITRY Wide range Phono Preamplifier In2. ohm test resistor But real loudspeaker impedances are usually lower than 8 ohms and reactive requiring greater reserves of voltage and current in the amplifier The NAD 7020 employs a high current power supply and the same rugged output transistors found in many 60 watt receivers so it is able to drive any speaker impedance even as low as 2 ohms to high levels with low distortion Soft Clipping When the 7020 is overdriven beyond its rated power this exclusive NAD circuit gently limits the waveform voltage ensuring that the output transistors are never driven into saturation or hard clipping Conse quently the 7020 can produce remarkably high peak volume levels without sounding harsh or distorted Infrasonic and Ultrasonic Filters In everyday listen ing audio signals often are contaminated with interference at frequencies below and above the range audible to the ear turntable rumble acoustic feedback and radio inter ference for example The 7020 strips off this interference so that only clean musical waveforms are amplified Bass and Treble controls are tailored for musically effective response in the high and low frequencies without altering the critical mid range tonal balance For listening at low volume levels or with sensitive head phones the 7020 s Audio Muting switch expands the useful range of the Volume control and subdues any residual circuit noise Separate Preamp Out and Power Amp In jacks ar
3. e provided on the rear panel of the 7020 for insertion of an equalizer dynamic range expander or time delay unit For the student or first time stereo shopper the no frills design and moderate price make the NAD 7020 an ideal choice for the music lover seeking uncompromised per formance few receivers at any price will sound as good in everyday use PRE AMP SECTION Phono input Input impedance Rand 9 Input sensitivity 1kHz Signal Noise ratio A weighted with cartridge connected THD 204z 20kHz Line level inputs Signal Noise ratio 4 weighted ref 1w Frequency response 20Hz 20kHz Infrasonic filter POWER AMP SECTION Continuous output power into 8Q Rated distortion THD 20Hz 20kHz IHF Dynamic headroom at 8Q IHF dynamic POWEF maximum short term power per channel FM TUNER SECTION Input sensitivity Selectivity alternate channel Harmonic distortion Signal Noise ratio Frequency response 0 5dB Channel separation at 1kHz AM TUNER SECTION Usable sensitivity Image rejection Remote NAD Link PHYSICAL SPECIFICATIONS Dimensions W x H x D Net weight Shipping weight 8Q 40 20 Mono 30dB THD N Stereo 50dB S N Stereo 60dB S N Mono Stereo Mono Stereo 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 sock
4. ets controls and buttons NAD Electronics All rights reserved E amp OE 47KQ 47pF 2 5mV ref 20W 75dB ref 5mV lt 0 02 86dB 0 5dB 3db at 15Hz 24dB octave 20W 13dBW 0 02 3dB 40W 58W 72W 10 8dBf 1 9uV 16dBf 3 5uV 37dBf 40V 65dB 0 2 0 3 75dB 70dB 30Hz 15kHz 42dB 250uV 50dB No No 420 x 119 x 240mm 6 8kg 8 4kg
5. stead of the economy preamp circuit often found in budget priced receivers the NAD 7020 contains a sophisticated 6 transistor phono Advanced Tuner IC Circuitry The 7020 s FM tuner section employs a junction FET front end for sensitive tuning of weak signals a total of three rather than one or two ceramic I F filters for sharp selectivity cleanly separat ing adjacent stations on the crowded FM dial and the latest PLL multiplex decoder for wide stereo separation with low distortion FM reception in direct comparisons has proven to be audibly identical in both sensitivity and sound quality to many costlier separate tuners Yet it is very easy to tune a set of three LED lights indicate exact tuning and signal strength The 7020 s AM reception aided by an adjustable ferrite rod aerial provides good suppression of static and adjacent channel interference EFFECTIVE CONTROL FEATURES Like every other part of its design the NAD 7020 s controls have been carefully selected for genuine usefulness The preamp stage which is audibly identical to some of the best separate preamps Its distortion is extremely low even with complex music signals it is quiet enough for use with either moving magnet or high output moving coil pickup car tridges and its 107 dB dynamic range is ample for the digitally mastered recordings of the 1980s High Voltage High Current Output Stage It s not difficult to design an amplifier to deliver 20 watts channel to an 8
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