STATUS - SOLD
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Description :
During the 1960's and 1970's Armstrong Audio was one of the most popular UK Hi-Fi brands. Their equipment combined good performance with stylish looks. This made their range attractive to many people who wanted a good quality audio system that fitted well into a home environment. The Armstrong provided a choice of tuners and tuner-amplifiers in the 200 range - and in the associated 100 range. The FM section of the Armstrong 223 was used in other models of the same range and in fact also used in the small brother 100 range models. The Armstrong 223 tuner's VHF/FM section has a coaxial 70 - 80 Ohm impedance input socket. The AM section provides an antenna connection and an earth connection. This is nominally for use with a long wire antenna of the kinds that were common during the period up to the early 1960's. The audio output performance of the VHF/FM section is essentially as quoted for the stereo decoder in terms of frequency response, etc.
The AM performance was signal level dependent. Given a strong signal, the AM section was potentially capable of a much better audio performance than many modern AM receivers. Commonly, a wider bandwidth could give more 'hi fi' results, but might mean some weaker stations were lost in noise and whistles. A narrow bandwidth would remove noise and whistles, but make the sound dull and lacking in treble. However, the Armstrong 223 AM tuner dealt with this problem by the ingenious method of allowing the IF bandwidth to vary according to the signal strength. The result was to provide a wide bandwidth (and hence better sound) for strong stations, and a narrow bandwidth (and hence cut down on whistles and noise) with weak stations.
Specifications :
AM Tuner
Coverage........................................500-1650 kHz
Sensitivity.......................................7 microV for 20dB SNR
IF Frequency...................................430 kHz
IF Bandwidth...................................2 kHz to 8 kHz (varies with signal level)
IF Rejection....................................60 dB
FM Tuner
Coverage.........................................87 - 108 MHz
Sensitivity.......................................2 microV for 20dB Quieting
IF Frequency..................................10.7 MHz
IF Bandwidth...................................220 kHz (-6dB points)
IF Rejection.....................................60 dB
Production Date..............................1967–1969
Tubes.............................................EF80/EBF89/ECH81/ECC83/ECC85
Dimensions (w x d x h).....................31 x 25.5 x 12 cm
Weight............................................5kg
Miscellaneous :
Made In...........................................UK, England
Condition.........................................4/10 (Rusty. 1 Knob missing)
Product Information :
http://www.audiomisc.co.uk/Armstrong/armstrong.html
http://www.audiomisc.co.uk/Armstrong/200/200page4.html
http://www.radiomuseum.org/r/motionelec_armstrong_amfm_tuner_223.html |
