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Stereo Amplifier 521

Stereo Amplifier 521; Armstrong Wireless (ID = 2012514) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012515) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012516) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012517) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012518) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012519) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012520) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012521) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012522) Ampl/Mixer
 
Stereo Amplifier 521; Armstrong Wireless (ID = 2012523) Ampl/Mixer
Stereo Amplifier 521; Armstrong Wireless (ID = 2012379) Ampl/Mixer Stereo Amplifier 521; Armstrong Wireless (ID = 2012380) Ampl/Mixer
Stereo Amplifier 521; Armstrong Wireless (ID = 2012381) Ampl/Mixer Stereo Amplifier 521; Armstrong Wireless (ID = 2012509) Ampl/Mixer
Stereo Amplifier 521; Armstrong Wireless (ID = 2012510) Ampl/Mixer Stereo Amplifier 521; Armstrong Wireless (ID = 2012511) Ampl/Mixer
Stereo Amplifier 521; Armstrong Wireless (ID = 2012512) Ampl/Mixer Stereo Amplifier 521; Armstrong Wireless (ID = 2012513) Ampl/Mixer
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Stereo Amplifier 521; Armstrong Wireless (ID = 2012379) Ampl/Mixer
Armstrong Wireless: Stereo Amplifier 521 [Ampl/Mixer] ID = 2012379 1024x649
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For model Stereo Amplifier 521, Armstrong Wireless and Television Ltd.; London:
photo with permission of owner
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Armstrong Wireless and Television Ltd.; London
Year: 1968 ?? Category: Audio Amplifier or -mixer
Semiconductors (the count is only for transistors) 21: BC109 AC191 AC191 XK1112 AC139 AC139 AL102 AC139 AL102 BC109 AC191 AC191 XK1112 AC139 AC139 AL102 AC139 AL102 AC139 AL102 AC139
Main principle Audio-Amplification
Wave bands - without
Details Hi-Fi equipment
Power type and voltage Alternating Current supply (AC) / 110; 120; 220; 240 Volt
Loudspeaker - This model requires external speaker(s).
Power out 50 W (undistorted)
from Radiomuseum.org Model: Stereo Amplifier 521 - Armstrong Wireless and
Material Wooden case
Shape Book-shelf unit.
Dimensions (WHD) 292 x 117 x 280 mm / 11.5 x 4.6 x 11 inch
Notes

2 x 25 watts output at 0.5% harmonic distortion
Frequency responce 20 to 25,000 Hz
Bass Control; ± 10dB @ 70Hz, Treble Control ± 10dB @ 10kHz.
Rumble filter; -5dB @ 30Hz increasing at lower frequencies
Treble filters 1;  6.5kHz -3dB, 10kHz -25dB
                   2;  4.5kHz -3dB,  9kHz -40dB
Loudness control; at 1kHz reference (-20dB), 70Hz +10dB, 10kHz +5dB

Outputs for Tape Recording and headphones

Inputs for;
1 Tape, 2 Radio, 3 Ceramic cartridge & 4 Magnetic Cartridge.

An later example of this amp, which appeared to be all original, was fitted with the following transistors.
C16 preamp board; BC384L BC1586 BC1586
A15 power amp board; XK1112 BSV44A BSV44A BSV44A AL102 AL102
Z17 power supply board AC139 AC139 AL102

Model page created by Mike Edwards. See "Data change" for further contributors.



All listed radios etc. from Armstrong Wireless and Television Ltd.; London
Here you find 19 models, 17 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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