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February 1941 QST
Something Radically New in ECOs
There are many approaches to the ECO design, most of them having been described in the past; such as expensive, ruggedly-built h.f. oscillators with their external regulated power supplies, low-frequency dual heterodyne oscillators, etc. All have their merits, but are necessarily expensive to manufacture and must ultimately end up by selling in the 50 to 60 dollar price bracket.
A new approach to this problem has been evolved by Henry Rice, Jr., and was described in detail in January OST. Probably the outstanding feature of the Rice development is its high-performance-per-dollar which makes possible a factory built commercial ECO with modern performance, complete with tubes, ready to use, for less than 30 dollars!