Compared to the technically superior superheterodyne the Neutrodyne was cheaper to build.
2.
The Neutrodyne ended this control, allowing competition.
3.
This was solved by the Neutrodyne circuit, and later the development of the tetrode and pentode around 1930.
4.
So the TRF circuit, including the Neutrodyne, became obsolete in radio receivers and was superseded by the superheterodyne design.
5.
In 1930, Crosley was marketing the " Roamio ", with " screen grid neutrodyne power speaker " for automotive use, priced at US $ 75 before accessories and installation.
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