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capacitor in the output stage. The amplifier featured inputs for tape, tuner and MM gramophone and on the front panel had 4 rotary controls for volume, bass, treble and balance. Underneath these controls were a series of black push buttons which allowed control of the input sources as well as loudness, high pass filters, rumble filters and tape bypass. The amplifier was presented with an aluminium, silk-screened front panel with a teak case and a matte black rear panel. The amplifiers were marketed from the 1968–1972 when it was replaced by 600 series.
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their factory was used to manufacture radios, public address systems, and various electronic parts. After the war, they began to produce television sets, as well as long range radios for ships, but eventually ceased production of those lines to manufacture radios, amplifiers and tuners for home
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It employed germanium AL102 transistors in its output stages and these had a reputation for failure and are now unobtainable although it is possible, with modification to replace these with newer, silicon transistors. The amplifier was a single rail design and employed an electrolytic output
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During the 1960s and 1970s they were extremely successful, creating several durable radio models which are still in use by consumers today, but by the end of the 1970s their lease on their factory ran out and it was decided not to invest in a new one. The building was torn down and the owners
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redeveloped it. Using plans developed for a further radio model, some of the staff continued on as
Armstrong Amplifiers, but due to a lack of capital and suitable manufacturing space, production did not last long.
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market began to take shape, the company name was changed to
Armstrong Audio and they focused their marketing and manufacturing at becoming hi-fi specialists.
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Today, what once was
Armstrong Audio is now called Armstrong Hi-Fi and Video Services and is based in
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was a stereo hi-fi amplifier from the
Armstrong Audio company and was marketed as 2 x 25W amplifier.
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730/732 Amplifier rev. by Noel
Keywood & Chris Thomas, September 1982
344:, 526 included in comparison of 10 tuner-amps, by Fred Judd, October 1920
301:, 426 Receiver (Amp + AM/FM tuners) rev., by George Goodall, October 1968
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399:(USA), 625 Receiver (Amp + FM tuner) rev. by Leonard Feldman, March 1978
405:, 602 Speakers as part of a 'system' rev., by Philip Mount, March 1978
237:, and they provide maintenance contract to a number of retail stores.
320:, review of 521 Amplifier, by Frank Roberts & Donald Aldous, 1969
363:, 626 Receiver (Amp + AM/FM tuners) rev., by Fred Judd, October 1973
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332:, Large comparison review including the 521 Amplifier, April 1970
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Armstrong 426 combined amplifier and tuner from the mid-1960s
369:, 626 Receiver (Amp + AM/FM tuners) review., December 1974
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Initially created to manufacture portable radios, during
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381:, Receivers 626 Review, by Angus McKenzie, 1976 Issue 2
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Audio equipment manufacturers of the United
Kingdom
387:, Amplifiers 621 Review, by Hugh Ford, 1976 Issue 6
314:, review of 521 Amplifier, by Fred Judd, April 1969
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262:PCU25 Preamp/Control Unit + A20 Valve Power Amp
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430:, postscript to July review, September 1982
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602:1932 establishments in the United Kingdom
508:"Product Manual: Armstrong A20 and PCU25"
106:Learn how and when to remove this message
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338:, review of 526, by Fred Judd, May 1970
276:, rev. by George W. Tillett, April 1962
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199:Armstrong Wireless and Television Ltd.
552:"Product Manual: Armstrong 600 Range"
530:"Product Manual: Armstrong 500 Range"
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577:UK Hi-Fi History (Armstrong section)
222:consumer use. In the 1950s when the
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455:"Armstrong Audio: A Brief History"
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162:Claude Charles Jackson
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121:Armstrong Audio Ltd.
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349:600 Range amplifier
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488:. Audio Miscellany
461:. Audio Miscellany
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558:6 September
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586:Categories
435:References
428:Hi Fi News
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