Stereo Amplifier 521
Armstrong Audio / Wireless & Television / Manufacturing; London
- Country
- Great Britain (UK)
- Manufacturer / Brand
- Armstrong Audio / Wireless & Television / Manufacturing; London
- Year
- 1968 ??
- Category
- Audio Amplifier or -mixer
- Radiomuseum.org ID
- 283408
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Transistors
- 21
- Semiconductors
- 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)
- Material
- Wooden case
- from Radiomuseum.org
- Model: Stereo Amplifier 521 - Armstrong Audio / Wireless &
- 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 +5dBOutputs 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
- Author
- Model page created by Mike Edwards † 25.10.21. See "Data change" for further contributors.
- Other Models
-
Here you find 24 models, 22 with images and 8 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Armstrong Audio / Wireless & Television / Manufacturing; London