The carrier in cable system dealt with in a companion paper involves many amplifiers in tandem with many telephone channels passing through each amplifier and constitutes therefore an ideal field for application of this feedback principle a field trial of this system was made at morristown new jersey in which seventy of these amplifiers were operated in tandem the results of this . Phase in feedback amplifier designbell system technical journal19 july 1940 421 54 2 for other accounts of blacks invention see hendrik bode feedback the history of an ideaproceedings of the symposium on active networks and feedback sys tems brooklyn 1960 reprinted in selected papers on mathematical trends in control theory ed richard bellman new york 1964 m . Network analysis and feedback amplifier design bell telephone laboratories series bode hendrik w on amazoncom free shipping on qualifying offers network analysis and feedback amplifier design bell telephone laboratories series. Transistor transistor innovation at bell labs executives at bell labs had recognized that semiconductors might lead to solid state alternatives to the electron tube amplifiers and electromechanical switches employed throughout the nationwide bell telephone system in 1936 the new director of research at bell labs mervin kelly began recruiting solid state physicists
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