NAD Electronics 4020A User's Manual
Contents
1. 4020A AM FM Tuner Date of manufacture Jan 81 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note that this document contains the text from the original product brochure and some technical statements may now be out of date The NAD 4020A is a rationally engineered moderately priced AM FM tuner whose performance in most locations and with most broadcasts is audibly identical to that of many more expensive and elaborate tuners The 4020 s quality of sound is limited only by the quality of the transmitted broadcast Recent dramatic advances in FM tuner circuitry particularly in the development of inexpensive but high performance building block circuit modules have been incorporated in the 4020A to provide excellent sound at a reasonable price Such crucial design parameters as sensitivity low distortion and wide stereo separation have been given priority over the inclusion of costly superfluous features and esoteric circuitry whose benefits are totally inaudible except in extreme reception conditions But no compromises whatsoever have been made in those performance areas which relate directly to the 4020 s listening quality in normal and even somewhat difficult reception locations HIGH SENSITIVITY The front end tuning circuit for example employs a Junction FET amplifier for an optimum combination of sensitivity to weak signals and resistance to cross modulation from strong signals The intermediate frequency I F amplifier a high gain IC provides2. excellent limiting static suppression very good AM rejection suppression of multipath interference and smooth muting of interstation noise LOW DISTORTION While budget priced tuners commonly contain one or two ceramic I F filters the NAD 4020A employs a total of three Their sharp selectivity minimises interference from adjacent stations on the increasingly crowded FM dial and their linear phase response contributes to minimum distortion of stereo broadcasts Multiplex stereo decoding is performed by the latest phase locked loop PLL IC In addition to low noise and wide stereo separation the PLL decoder yields the lowest distortion in stereo reception in particular minimum inter modulation between high audio frequencies and the 19 kHz stereo pilot tone WIDE STEREO SEPARATION It is important to maintain wide stereo separation at low and high frequencies as well as the commonly specified 1 kHz midrange point in the 4020A phase shift of the composite signal is minimised in order to preserve full low frequency separation and a special NAD phase compensated crosstalk cancellation circuit increases high frequency separation and minimises any residual distortion Instead of a costly and fragile moving coil tuning meter the 4020A has a set of three LED indicator lights which form a remarkably simple and accurate meter Either of two amber LEDs illuminates when the 4020A is mistuned to either side of a station frequency and a green LED illumi
3. nates when the station is optimally tuned for minimum distortion within 0 025 MHz The brightness of the green tuning LED indicates the signal strength when it is dim the station is too weak for optimum reception For the music lover seeking uncompromised performance for a modest investment the NAD 4020A is the logical choice There are more costly tuners available some of which have more impressive specifications but very few sound better in everyday use FM TUNER SECTION Input sensitivity Capture ratio 45 65dBf AM rejection 45 65dBf Selectivity Image rejection F rejection Harmonic distortion Signal Noise ratio Frequency response 0 5dB Channel separation at 1kHz AM TUNER SECTION Usable sensitivity Selectivity Image rejection F rejection Remote NAD Link PHYSICAL SPECIFICATIONS Dimensions W x H x D Net weight Shipping weight Mono 30dB THD N Mono 50caB S N Stereo 50dB S N Mono Stereo Mono Stereo 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 amp OE 10 9dBf 1 9uV 75Q 16dBf 3 5uV 75Q 37dBf 40uV 75Q 1 5dB 60dB 65dB 50dB 75dB 0 2 0 3 75d0B 70dB 30Hz 15kHz 42dB 250V 30dB 50dB A0dB No No 420 x 96 x 240mm 4 2kg 5 6kg
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