.
‘
l
l
'
'
'
.
6—11.
ELECTRON COUPLING
'
129
.
._
tode, there is no physical suppressor in the path of the electrons
and the tube is classed as a tetrode.
"
6—11.
Electron
Coupng.—Tubes have been constructed
.
which contain a lament, a plate and four or ve grids. The latter
are called penta-grid converters. 'The rst grid, near the lament,
is used as the control grid of a triode whose “plate” is the second
grid. This triode is used as an oscillator in one of the many forms -
of vacuum tube oscillators.
As a result of the uctuating grid
voltage, the‘current to the “plate” (grid number 2) is
'
increased and_decreased.
The number of electrons which pene—
trate the second grid and enter the remainder of the tube is thus
'
increased arid decreased periodically. It is as though it were '
possible to have a (virtual) cathode Which emitted a periodically
varying number of electrons by alternately‘heating and cooling.
,
There are vari0us uses to Which the pulsating stream of electrons
'
can be put in the remainder of the tube, such, for example, as the
modulation of a
signal in a super—heterodyne
receiver.
The m‘odulated p0rtion Of this .penta—grid converter is
said to be electron cOupled With the oscillatôr, as contrasted with the
usual inductive or capacitative coupling methods.
—
6—12.
Electron“ Optics.——The analogy between light beams
and electron beams 'is‘
the deection Of charged
particles by
elds is
the deection of light raÿè' fmdttd in, the study of
—
geometrical opt1csandsecond,thed1racùon,
etc.,
of electron wavescorrespondswàesamephenemena1‘or light‘ -
waves asstudædmàesubiectofphrsmal :.»0Ptics- Let us
…
“
JΗgeldstrengthmoerstedsande/mmmemuThusthefecallength
‘
l
l
'
'
'
.
6—11.
ELECTRON COUPLING
'
129
.
._
tode, there is no physical suppressor in the path of the electrons
and the tube is classed as a tetrode.
"
6—11.
Electron
Coupng.—Tubes have been constructed
.
which contain a lament, a plate and four or ve grids. The latter
are called penta-grid converters. 'The rst grid, near the lament,
is used as the control grid of a triode whose “plate” is the second
grid. This triode is used as an oscillator in one of the many forms -
of vacuum tube oscillators.
As a result of the uctuating grid
voltage, the‘current to the “plate” (grid number 2) is
'
increased and_decreased.
The number of electrons which pene—
trate the second grid and enter the remainder of the tube is thus
'
increased arid decreased periodically. It is as though it were '
possible to have a (virtual) cathode Which emitted a periodically
varying number of electrons by alternately‘heating and cooling.
,
There are vari0us uses to Which the pulsating stream of electrons
'
can be put in the remainder of the tube, such, for example, as the
modulation of a
signal in a super—heterodyne
receiver.
The m‘odulated p0rtion Of this .penta—grid converter is
said to be electron cOupled With the oscillatôr, as contrasted with the
usual inductive or capacitative coupling methods.
—
6—12.
Electron“ Optics.——The analogy between light beams
and electron beams 'is‘
the deection Of charged
particles by
elds is
the deection of light raÿè' fmdttd in, the study of
—
geometrical opt1csandsecond,thed1racùon,
etc.,
of electron wavescorrespondswàesamephenemena1‘or light‘ -
waves asstudædmàesubiectofphrsmal :.»0Ptics- Let us
…
“
JΗgeldstrengthmoerstedsande/mmmemuThusthefecallength