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Патент USA US2412992

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Dec, 24, 1946.
Filed April 20, 1942
B, nNMB H?o
Patented Dec. 24, 1946
2,412,992 '
Emile Labin, New York, N. Y., and Ross B.
Hoffman, East Orange, N. J., assignors to
Federal Telephone and Radio Corporation, a
corporation of Delaware
Application April 20, 1942, Serial No. 439,746
14 Claims.
(Cl. 315-38)
This invention relates to improvements in elec
tron discharge tube circuits, and in particular
includes an anode of the re-entrant type having
to such circuits for use at ultra-high frequencies.
It is an object of the invention to provide
an improved means for making circuit connec
tions to electron discharge devices for ultra
ternally of the device for cooling purposes. The
anode is of generally cup-shaped form, and dis
a substantial portion H thereof extending ex
; posed concentrically therein are the grid and
cathode electrodes. The grid is physically sup
ported by an annular disc l2 that extends out
Another object is to provide an improved push
side the envelope of the tube. Filament connec
pull type circuit for such devices.
tions I3, 14 are provided at the end of the
A further object is to provide an ultra-high 101 tube remote from the anode. Disc l2, besides
frequency circuit for use with an electron dis
serving as a support for the grid electrode, is
charge tube and permitting ei?cient operation,
also a lead-out connection. In the form shown,
good cooling of electrodes, and ready accessi
lead-out I2 is formed with two axially extending
bility of the tube.
annular ?anges l5, l6 tapering down for pur
Other objects and various further features of
poses of eiTecting a sealing relation with the in
novelty and invention will hereinafter be point
sulating portions I1, 18 of device it. As shown
ed out or will become apparent to those skilled
more clearly in the cross-sectional view of Fig. 2,
in the art from a reading of the following speci
the external cooling portion H of the anode in
?cation in connection with the drawing includ
cludesa number of longitudinally and radially
ed herewith. In said drawing—
20 extending spaced surfaces for better heat radia
Fig. 1 is a partly sectionalized longitudinal ele
tion, as will be clear.
vation of apparatus in accordance with the in
In the arrangement shown, two discharge de
vention; and
vices like the one just described are mounted
Fig. 2 represents a section taken substantially
in axial alignment with their anode cooling por
in the plane 2—2 of Fig. 1.
25 tions ll adjacent one another. The tubes are
It is known that in electron discharge tube
held in this position by means of a cylindrical
construction for operation at ultra-‘high frequen
member l9 frictionally engaging the end portions
cies, it is of the utmost importance to maintain
of the anode cooling elements. In order to be
concentricity of electrode elements» within the
able to insert the discharge tube precisely into
tube and to reduce the length of lead-in con
the mounting member 19, the latter includes
nections to a minimum. Many of these devices
clamping means 28 for securely holding the tube,
are accordingly so designed as to ?t directly into‘
and a bottom seat 2!, whereby the extent to
co-axial line structures which may be used as
which the tube may be inserted in cylinder 19
resonating means for maintaining the tube in
may be limited. Cylinder I9 is rigidly connected
high frequency operation.
oscillation or for other purposes.
Devices of 35 to a further cylinder 22 so as to form a T joint
this nature and circuit connections therefor have
been shown, for example, in the copending ap
plications for patent of G. Chevigny and E. Labin,
Serial No. 427,728 ?led January 22, 1942; Serial
No. 431,134 ?led February 14, 1942; and Serial
No. 434,914 ?led March 16, 1942. These devices
are generally of the external anode type whereby
the anode may be better cooled to increase oper
ating e?iciency. Connection to the grid as Well
therewith. It will be noted that when clamping
means 29 is viewed with cylinder is, a con?ning
passage is de?ned about the anode cooling ele
ments, said passage being substantially coexten
sive therewith. As a result. very effective cooling
of the‘ two discharge tubes supported by cylinder
19 may be obtained when a cooling medium is
introduced into or sucked through pipe 22. In
the form, shown, pipe 22 is mounted on a plat-v
as support thereof is by means of an annular 45 form 23 spaced from the chassis 24 of the ap
disc-like member passing through the envelope,
1 whereby the concentric transmission line connec
paratus by means of insulating pedestals 25.
The push-pull oscillator arrangement shown
tion may be made directly thereto when desired.
is of the type wherein ‘one resonant condition
The present invention makes possible the use
is made to occur in a circuit including a grid-to
of discharge devices of this nature in a push-J 50 grid and an anode-to-anode connection and input
pull circuit arrangement wherein highly e?icient.
operation is possible due to unique disposition.
of the circuit elements. Referring particularly
to the arrangement shown in Fig. 1, a suitable
discharge tube [0 of the above-indicated nature
circuitresonance is made to occur in the cathode
to-grid circuits of the respective tubes- The
?rst of these resonating circuits comprises a large
generally cylindrical member 21 substantially en
closing both the discharge tubes co-axially. Mem
ber 25? is galvanically connected to the grids of
these tubes by annular adapter means 28 ?xed
as by clamping to the disc-shaped lead-out E2
of each discharge tube. Adapter ‘28 in the form
shown makes galvanic connection with cylinder
by means of a number of conductive ?ngers
extending radially outward into wiping fric
tional engagement with the inner surface of cyl
The grid-to-grid resonating circuit
thus substantially comprises the inductance of
the portions of the inner surface of cylinder 21
intermediate the ?ngers 29 associated with each
discharge device, together with the inherent ca
pacity between grid and anode elements of each
tube, as will be clear.
manner and the other of which 115 is hinged to
the first part by means (it ?xed to the outer sur
face thereof. Locking means for securing cover
£15 with respect to the ?xed part of cylinder 27
comprises a bayonet-type locking plate 6? slid
a'ole longitudinally as permitted by slots 43 there~
in into locking or unlocking position. When in
locked position, further security is obtained by
means of a number of clamping screws
may be provided with knurled edges for manual
operation. It is thus possible to obtain complete
access to both tubes by effectively removing hall‘
of the enclosing cylinder
In accordance with a further feature oi the
invention, clamping device it‘ permits the ready
removability and adjustment of the discharge
devices with respect to the above-described cir
As above indicated, input tuning for each
discharge tube is accomplished between cathode
cuit. Device 26 in the form shown comprises an
and grid electrodes. Preferably, the ?laments of
annular collar 58 threaded on the inside and
the discharge tubes are of the double-helix type
in this manner with a portion of
wherein grounding connection is made to the
cylinder l9. ri‘oward the end of cylinder it‘ at
mid-point, and heater supply is furnished at the
which collar 53 is threadingly engageable, cylin
free ends of the helixes. Connections to these
free ends are made by leads 3%, 3i and to the
mid-point by leads 32. In the form shown, the
der i9 is longitudinally split preferably along
diametrically opposite lines, thus forming two
leads 39, {ii are brought outside the apparatus 25 semi-circular sections. One of these sections Si
is transversely cut oil from the rest of cylinder
by means of a large by-pass-condenser arrange
l9 and hingedly related thereto as about a pintle
ment whereby radio frequency voltages are kept
Thus, when collar 58 is removed by unscrew
within the oscillator assembly. In the form
ing, portion 5! of cylinder IQ may be swung
shown, this by-pass-condenser arrangement com
prises two large plates 33, 35c separated from each 30 into upward position, and the discharge tube
may be readily removed. Collar
other by a thin sheet of insulating material, such
with a
as mica. Heater supply is made directly to these
corresponding conical surface on the end of cyl
plates by connections to terminal bolts 35, 31.
inder it whereby when collar
is turned into
The lay-passing arrangement comprising plates
tightening position, the hinged portion
33 and 3d separated by the mica sheet 35 is sup
ported in insulated relation within a conductive
portions of the cooling surfaces oi the discharge
cylinder 38 by means of blocks 34' and mica
tube anode. When it is desired merely to ad
sheets 35'. This arrangement maintains the leads
just the axial disposition of a discharge tuoe with
iii}, 3!, 32 at the same radio frequency potential
respect to cylinder IS), a slight release of collar
and thus ?xes the potential of the mid-point of
56 by unscrewing will loosen the grip of the semi
the filaments.
circular sections of cylinder it on cooling sur
An extension 2?’ of cylinder 2'! concentrically
faces ii and thus, permit this adjustment, as
surrounds the above described ?lament lead-out
be clear.
arrangement. Cylinders 27’ and 38 are galvani
It will be seen that the structure described
cally joined at their left ends. Additional gal 45
permits a highly e?icient connection of two dis
vanic association between cylinders 2's" and 38
charge tubes in push-pull for operation at ele
is made by means of an annular connecting link
vated frequencies. By means of this structure,
3:’) adjustably slidable, as by means of a push rod
all radio frequency currents are assuredly main
39', longitudinally of the filament lead-out by
pass~condenser assembly. In the form shown, 50 tained within the structure, thus making for a
minimum degree of losses. Output connection
and 2?’ are electrically associated
to the arrangement may be made through a gen
by a capacitance formed ‘between radially extend
erally oval aperture 54 in the surface of cylinder
ing flanges 133, d! integral with cylinders 21 and
2'! to permit a U-type inductive coupling 55 to
2?’. For a rigid and accurate control of the
anode circuits. It is particularly to be point
spacing and alignment of cylinders 12'! and 21',
ed out that the arrangement for mounting the
an annular disc d2 of hard molded dielectric ma
two discharge tubes comprising cylinder 69 and
terial is clamped between the flanges
Lil. The
clamping arrangement 29 requires but little in
grid-to-cathode oscillating circuit for each dis
crease in overall diameter of the cooling elements
charge device thus substantially comprises the
capacitance between ?anges £8, 4! and the in 60 II of the discharge devices and, accordingly, in
troduces substantially no deleterious effects in
ductance of the various leads-out in addition to
operation of the arrangement. It is further to
that of the portions of cylinders 27 and 27' be»
be noted that the cooling stream of air or other
tween adapter 23 and sliding contact 36, as will
coolant supplied through cylinder 22 is forced to
be clear. As in the case of the anode support
22, cylinder 2'? is rigidly supported above chassis 65 take a path covering substantially the entire
surface of every cooling member for the anodes
by'means of pedestals 43 of insulating material
of the discharge devices. Upon discharge of the
and the end cylinders ‘it?’ are likewise supported
coolant adjacent the base of the anode itself,
by such insulating pedestals 44!.
this cooling medium is symmetrically directed so
Ease and accessibility for replacement and
adjustment of the discharge tubes within resonat~ 70 as effectively to cool other portions of the circuit,
such as adapters 23, and hence the grid elec
ing cylinder 2'! form a further feature of the
invention. In the form shown, cylinder 21 is
While the above invention has been described
formed in two parts of generally semi-circular
in detail in particular connection with the pre
cross-section, one ' of which parts is fixedly
ferred forms illustrated, it is to be understood
mounted to the chassis in the above-described
that many modi?cations, additions and omissions
may be made fully within its scope, as de?ned
by the appended claims.
What is claimed is:
l. A cooling arrangement for simultaneously
eluding radially and longitudinally extending
cooling surfaces, said arrangement comprising a,
hollow cylindrical member frictionally engaging
said cooling surfaces and extending longitudi
nally therebeyond.
cooling an electrode of each of two electron dis
charge devices, each said electrode havingv a heat
6. An arrangement according to claim 5
wherein said hollow cylindrical member includes
conducting portion extending externally of each
annular clamping means at the end thereof about
said device, each said portion being generally cy
said cooling surfaces, whereby said discharge de
lindrical and including radially extending cooling 10 vice may be adjustably related with respect to
surfaces, said arrangement comprising a hollow
said mounting arrangement.
cylindrical member mechanically engaging said
7. A push-pull arrangement according to claim
Cooling surfaces of one said discharge device at
4 for use with discharge devices including ?la
one end of said member and said cooling surfaces
ments with lead-out conductors from the mid
of the other said discharge device at the other 15 points thereof, and wherein said further cylin
end of said member, and a tubular connection to
drical member includes a portion extending be
said member between said portions.
yond said galvanic associations, further compris
2. A device for use at ultra-high frequencies
ing a generally tubular member at least partially
for making connection to and cooling a generally
within said further cylindrical member, and dis
cylindrical electrode lead-out on each of two
posed co-axially with respect thereto and with
electron discharge devices, each said lead-out in
respect to said discharge devices and adaptable
cluding a plurality of longitudinally and radially
for galvanic connection to one said lead-out con
extending cooling surfaces, said device compris
ductor, and longitudinally slidable tuning means
ing a, hollow cylindrical member mechanically
electrically associating said extended portion of
engaging the outer edges of said cooling surfaces
said further cylindrical member and said tubular
on both said ‘discharge devices, a tubular con
nection to said cylindrical member extending
8. A push-pull arrangement according to claim
generally radially therefrom and communicat
4-.for use with discharge devices including ?la
ing with the inside of said member.
ments with lead-out conductors from the mid
3. An ultra-high frequency push-pull electron 30 points thereof, and wherein said further cylin
discharge tube circuit for use with two such tubes
drical member includes a portion extending be
each having a ring-type grid electrode lead-out
yond said galvanic associations, further compris
and an anode having an external generally cy
ing a, generally tubular member at least par
lindrical cooling portion concentric with said
tially within said further cylindrical member,
lead-out, said circuit including a hollow cylindri- : and disposed co-axially with respect thereto and
cal member mechanically engaging both said
with respect to said discharge devices and adapt
cooling portions and maintaining said tubes sym
able for galvanic connection to one said lead
metrically disposed in substantially axial align
out conductor, and longitudinally slidable tuning
ment, a further cylindrical member of conductive
means electrically associating said extended por
material co-axially disposed with respect to said 40 tion of said further cylindrical member and said
tubes and galvanically associated with each said
tubular member, said extended portion of said
lead-out, said further cylindrical member having
further cylindrical member including an annular
an aperture therein substantially intermediate
discontinuity therein and a section of dielectric
said galvanic associations, and a tubular connec
material at said discontinuity whereby said dis
tion to said ?rst-mentioned cylindrical member
continuity forms a capacitance.
extending generally radially therefrom through
said aperture in spaced relation with respect
thereto and in communication with the inside
of said ?rst-mentioned cylindrical member.
4. An ultra-high frequency push-pull electron
discharge tube circuit for use with two such tubes
9. A circuit according to claim 4 wherein said
further cylindrical member includes two pieces of
generally semi-circular cross-section and look
ing means mounted external of said pieces for
holding the same in locked relation.
10. Tuning means for a push-pull ampli?er
each having a ring-type grid electrode lead-out
and an anode having an external generally cylin
drical cooling portion concentric with said lead
out, said circuit including a hollow cylindrical
member engaging both said cooling portions and
having a cathode, a grid, and an anode, said tun
ing means including cylindrical conductive means
maintaining said tubes symmetrically disposed in
substantially axial alignment, a further cylindri
ing said grids, both said cylindrical conductive
comprising two electron discharge tubes each
galvanically connecting said anodes, further cy
lindrical conductive means galvanically connect
means being co~axial, and means external of said
cal member of conductive material co-axially
cylindrical conductive means for tuning the grids
disposed with respect to said tubes and effectively (ii) and cathodes, comprising a first tuning means
connected to each said lead-out at least in re
for the grid and cathode of one of said tubes, and
spect to high frequencies, said further cylindrical
a second tuning means for the grid and cathode
member having an aperture therein substantially
of the other of said tubes.
intermediate said effective connections, and a
11. Push-pull ampli?er tuning means compris
tubular connection to said ?rst-mentioned cylin
ing two electron discharge tubes each having a
drical member extending generally radially
cathode, a. grid, and an anode, cylindrical con
therefrom through said aperture in spaced rela
ducting means galvanically coupling said grids
tion with respect thereto and in communication
together and said anodes together and forming
with the inside of said ?rst-mentioned cylindri
with the interelectrode capacities between said
cal member.
grids and anodes a resonant circuit, and separate
5. A mounting arrangement for an ultra-high
tuning means external of said cylindrical con
frequency electron discharge device having an
ducting means for separately tuning the grid and
cathode of each said tubes.
ing externally of said device, said heat-conduct
12. A push-pull ampli?er circuit comprising two
ing portion being generally cylindrical and in-‘ 75 electron discharge tubes each having a cathode, a
electrode with a heat-conducting portion extend
grid and an anode, said anodes being connected
to each other, a hollow tube connecting said grids
with one another, a ?rst concentric line, means
for directly connecting the inner conductor of
said concentric line to the cathode of one tube,
means for capacitatively coupling the outer con
ductor of said concentric line to one end of said
concentric lines are of substantially the same di
ameter as said hollow tube.
14. A push-pull ampli?er circuit comprising
two electron discharge tubes each having a cath
ode, a grid and an anode, said anodes being con
nected to each other, a hollow tube connecting
said grids with one another and provided with
?anges at its outer ends, a ?rst concentric line
including an outer cylindrical conductor having
directly connecting the inner conductor of said
second concentric line to the cathode of the 10 a ?anged end in juxtaposition to and insulated
from one ?anged end of said hollow tube and an
other tube, and means for capacitatively coupling
hollow tube, a second concentric line, means for
the outer conductor of said second concentric line
to the other end of said hollow tube.
13. The combination according to claim 12, in
which said concentric lines are coaxial with said
hollow tube and the outer conductors of said
inner conductor connected to the cathode of the
other tube.
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