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...ifier]] utilizing symmetrical [[cathode]]-coupled [[Bridged and paralleled amplifiers|bridge]] layout of the output stage. Original circlotrons of 1950s used [[o * [[Cecil Hall|C. T. Hall]] filed ''Parallel Opposed Power Amplifiers'' on June 7, 1951; U.S. Patent 2,705,265 was granted on March 29, 1955. ...

...ted to be specified in the early days of [[telecommunications]]. At first, amplifiers were not available and, when they did become available, they were expensive ...idth advantages. The nominal impedance of the transmission line and of the amplifiers and equalisers in the transmission chain will all be the same value.<ref na ...

...worth filters could be implemented in ladder topology without the need for amplifiers. Possibly the first to do so was William Bennett (1932)<ref>William R. Ben ...filter, but it is a relatively trivial one mathematically since the active amplifiers used by Butterworth ensured that each stage individually worked into a resi ...

| image1 = Fleming valve.jpg | caption1 = Early Fleming valve. ...