Transistorized audio-frequency telephone line amplifier, 1954

Transistorized audio-frequency telephone line amplifier Transistorized audio-frequency telephone line amplifier

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Transistorized audio-frequency telephone line amplifier
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Transistorized audio-frequency telephone line amplifier
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Transistorized audio-frequency telephone line amplifier, probably designed and made at the Post Office Research Centre at Dollis Hill, London, England, 1954.

Very soon after the development of successful transistors in 1947, the Post Office Research Station at Dollis Hill, London, were working on their use in telephone repeaters (amplifiers). This is a single transistor amplifier with a diode in order to protect the transistor against electronic surges. Seventeen of these were constructed in the latter part of 1954 and were put on field trial.

Details

Category:
Telecommunications
Object Number:
1971-439
Materials:
metal (unknown)
Measurements:
overall: 146 mm x 83 mm x 60 mm, .56kg
type:
amplifier
credit:
Donated by BT Heritage and Archives