Tubes with more grids, such as the pentagrid converter, can be used to make transitron oscillators with higher transconductance, resulting in smaller negative resistance.
12.
The All American Five was to use a pentagrid converter from when it first appeared in 1934, right up until valves became obsolete when transistors took over.
13.
Other tubes with multiple grids beside the pentode, such as the hexode and pentagrid converter tube, have been be used to make similar negative transconductance oscillators.
14.
The frequency mixer was of the pentagrid converter design to save the cost of a separate detector and first audio stage were provided by a dual diode / triode combination tube.
15.
The pentagrid converter in either guise operated extremely well, but it suffered from the limitation that a strong signal was able to'pull'the oscillator frequency away from a weaker signal.
16.
It is known that Donald G . Haines of RCA applied for a patent for the pentagrid on 28 March 1933 ( subsequently granted on 29 March 1939 ) under US patent number 2, 148, 266.
17.
The pentagrid was part of a line of development of valves that were able to take an incoming RF signal and change its frequency to a fixed intermediate frequency, which was then amplified and detected in the remainder of the receiver circuitry.
18.
However, the Ferranti company of Great Britain entered the valve business with the first known UK-produced pentagrid, the "'VHT4 "', late in 1933 ( though it must have been in development, and would certainly have existed as a prototype well before that time ).
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