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Патент USA US2118668

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May 24, 1938.,
Filed Oct. 23, 1957
I: 57.5.
Patented May 24, 1938
' 2,118,668
Harry M. Gaun, Emporium, Pa., assignor to Hy
grade Sylvania Corporation, Salem, Mass, a
corporation of Massachusetts
Application October 23, 1937, Serial No. 170,546
7 Claims.
(Cl. 250-275‘)
This invention relates to radio tubes and more
especially to the electrode assemblies or mounts
of such tubes.
A principal object of the invention is to pro
vide‘ an improved manner of aligning, and re
taining in alignment, the various parts of a tube
Another object is to provide an electrode mount
for a radio tube or the like having at one end
a metal collar of novel formation whereby the
?nished tube is singularly free from microphonic
noises and liability of short circuits between the
collar and remaining parts.
A feature relates to a radio tube mount having
15 a metal collar and an associated mica spacer
member having cooperating embossings and
perforations to facilitate proper assembly and to
prevent relative shifting of the mica with respect
to the collar.
Another feature relates to the novel organiza
tion, arrangement and relative location of parts
which go to make up an efficient and expeditious
ly assembled radio tube mount.
Other features and advantages not speci?cal
,, ly enumerated will be apparent after a consider
' ation of ‘the following detailed descriptions and
the appended claims.
While the invention will be described herein
as embodied in one particular type of radio tube,
it will be understood that this is done merely
for explanatory piu‘poses and not by way of limi
tation to the speci?c embodiment shown. Ac
cordingly in the drawing,
Fig. 1 is a vertical sectional View of a radio
tube embodying the invention.
Fig. 2 is a cross~sectional View of the tube of
Fig; 1 taken along the line 2-2 thereof and
viewed in the direction of the arrows.
Fig. 3 is a cross-sectional view of the tube of
Fig. 1 taken along the line 3-—3 thereof and
viewed in the direction of the arrows.
Fig. ll is a partial side elevational view of the
upper part of the tube of Fig. 1 with certain
of the parts omitted for the sake of clarity.
Fig. 5 is an enlarged View of part of the metal
collar and mica disc assembly of Figs. 1 to L1.
Referring more particularly to Fig. 1 the tube
therein shown is of the type designated “Sylvania
Type 6K ”, a triple grid super~control ampli?er
tube. The tube mount to be described, is en
closed within a metal enclosing envelope l which
is hermetically sealed at its lower end to the metal
cup 2 within which is seated the circular in
sulator disc 3 carrying the usual metal contact
‘ prongs 4 which, in the particular tube illustrated,
are eight in number. The metal cup or header
2 is provided with a series of metal eyelets 5
through which pass the various lead-in wires and
into which are sealed the necessary mount sup
port wires. In the well-known manner glass
beads 6 are sealed into the top ends of the eye
lets to insulate the wires from the header and
to provide a vacuum tight seal between said wires
and the header. A suitable exhaust tubulation
(not shown) is connected to the header so that
the envelope can ‘be exhausted in‘ the convention
al manner, Preferably the eyelets 5 are disposed
on. the header on a circle concentric with the
center of the header.
The tube mount is preferably of the unitary
construction type comprising a cylindrical in
directly heated cathode ‘I with any well known
form of insulated heater ?lament on the in
terior thereof; a wire-wound control grid 8, hav
ing the turns thereof fastened to the side-rods 20
9, ill; a wire-wound shield-grid ll, having the
turns thereof fastened to the side-rods l2, I3;
a wire-wound suppressor grid l4 having the turns
thereof fastened to the side-rods l5, l6; and a
tubular metal plate or anode ll having oppositely
disposed reentrant channels l8, 19 within which
are received the plate side-rods 28, 2| and to
which the plate is welded or otherwise fastened.
A pair of main vertical metal uprights or sup
ports 22, 23‘ have their lower ends bent at right
angles and welded to the header 2. Carried by
the supports 22, 23 in spaced relation to the
upper and lower edges of the plate I‘! are two
cup-shaped metal collars 24, 25 each of which
has in the bottom thereof an elongated slot‘ 26
to allow the various side rods and the cathode
sleeve to protrude therethrough without being
short-circuited. While the collars may be fas
tened to the uprights 22, 23 in any suitable man
ner, it is preferred to strike out from the ends
of the slots 26 integral tabs 21 which may be
welded to the said uprights.
In order to space the various electrodes per
manently and accurately from each other there
are provided upper and lower insulator discs 28,
29 of mica or other suitable insulation, which are
provided with suitable perforations to receive the
ends of the cathode sleeve, and the various side
rods illustrated. Preferably, although not
sarily, the discs 28, 29 are circular and
same diameter as the associated collars
In order to center the discs with respect
of the
2t, 25.
to the
collar and to prevent relative movement there
between should the disc diameter be less than the
collar diameter, the latter is‘ provided with a
15 O
2,1 18,668
series of embossings 30 which cooperate with a
similarly positioned series of perforations 3| in
the mica discs.
Preferably, and as shown in
enlarged detail in Fig. 5, the perforations in the
mica are slightly smaller than the maximum
diameter of the embossings 30 so as to space the
mica discs a predetermined distance from the
bottom of the collar.
The mica discs may be held in place on the sup
10 ports 22, 23 in any well-known manner, for ex
ample, by metal eyelets, or by swaging the sup
ports above and below the discs. Preferably
however, the said mica discs are held in place
by engaging the end turns of the various grids.
15 In other words the micas are prevented from
moving vertically by engaging the end turns of
the grids, and they are prevented from shifting
horizontally by reason of the embossings 30 which
partially project into the mica disc perforations
20 3|. It should be noted that the perforations in
the collars through which the plate side-rods
20, 2| pass, are materially larger in diameter than
the said side-rods so as to avoid short circuiting
of the parts. With the construction as described,
25 the plate is independently supported so far as
vertical displacement is concerned and for this
purpose the plate side-rod 20 may be welded at
its lower end to a support wire (not shown) sealed
into a glass-bead and eyelet (not shown in Fig.
30 1) similar to those shown. Likewise electrical
connection to the ends 32, 33 of the cathode
heater is made through the lead-in wires 34, 35
sealed into the associated glass beads and eye
lets 36, 31. The cathode sleeve may be held in
35 place against vertical displacement in any well
known manner, for example, it may be ?attened
at its upper end to extend laterally beyond the
edge of the associated perforation in the upper
mica disc 28. The cathode sleeve may be sup
40 ported at its lower end by a metal tab 38 welded
to one of the lead-in wires (not shown). The
upper ends of the control grid side-rods 9, H] are
connected by a metal strap 39 which in turn is
connected by a lead-in wire 40 insulatingly sealed
45 through the upper end of the envelope l. A
contact cap 4| is connected to the lead-in wire
39, said cap being insulatingly supported on the
top of the metal envelope. The shield grid H is
connected through side-rod l3 at its lower end,
50 to a lead-in wire 42 sealed into the header 2 by
an eyelet and glass bead seal. Likewise the sup
pressor grid M is connected through the lower
end of side-rod l5 to the lead-in wire 43 insulat
ingly sealed into the header 2; and plate I1 is
connected through the lower end of side rod 20
to a lead-in wire also insulatingly sealed into the
The method of assembly of the various parts is
believed to be obvious from the foregoing de
60 scription. Suflice it to say that the metal collar
24 is positioned on the uprights 22, 23 and welded
thereto, whereupon the mica disc 29 is dropped
into the collar so that the embossings 30 reg
ister with the perforations 3 l . The cathode sleeve
65 is then supported in place with its lower end
passing through the mica. The grids are then as
sembled on the lower mica with their lower end
turns engaging the mica. The plate electrode I‘!
with its side-rods 20, 2| is then assembled on
the lower mica. The upper mica 28 may then be
assembled over the cathode and side-rods and all
the electrodes properly centered by being held
in a suitable jig. The collar 24 is then assembled
over the upper ends of the cathode and side-rods
76 with the embossings 30 registering with the per
forations 3| in mica disc 28 and the tabs 21 are
then welded in place. The strap 39 with its
lead-in wire 40 is then welded to the grid side
rods 9, Ill. The cathode, shield-grid and sup
pressor grid may then be connected to their re :3
spective lead-in wires in the header 2. The
metal envelope I is then welded to the header
2 and then evacuated in accordance with any
well-known exhaust schedule, it being under
stood that the lead-in wire 40 is ?rst insulating
ly sealed through the top of the envelope. It
will also be understood that a suitable “getter” is
mounted at a convenient place within the en
velope and is ?ashed at the appropriate part of
the exhaust schedule. After the tube has been 15
evacuated and sealed off, the base 3 with its con
tact prongs is applied, and the various lead-in
wires are connected to the corresponding prongs.
If desired the base 3 may be provided with a
suitable locking and guiding key (not shown) to 20
facilitate insertion of the tube in a correspond
ing contact socket.
While one speci?c embodiment of the invention
has been illustrated, it will be understood that
various changes and modi?cations may be made 25
therein without departing from the spirit and
scope of the invention. For example, while the
drawing shows the micas and collars aligned
and spaced by a set of four embossings, a greater
or less number may be employed. Preferably, 30
the embossings 30 and the perforations 3| are
located symmetrically with respect to the hori
zontal and vertical centers of the collars and
micas so that the alignment of one embossing
with its associated mica perforations automati 35
cally aligns the remaining embossings and mica
perforations. While the invention has been illus
trated in a radio tube of the metal envelope type,
it can be equally well embodied in a radio tube
of the glass bulb type.
What I claim is:
1. A radio tube mount including a plurality
of electrodes, at least one insulator disc having
perforations to receive projections from said elec
trodes to maintain them in axially spaced rela
tion, a metal collar positioned adjacent one end
of the mount, and cooperating embossings and
perforations on the collar and disc to maintain
the electrodes in ?xed spaced relation to the
2. A radio tube mount including a cathode and
at least one electrode having side rods, an insulat~
ing spacer disc through which said side rods pass,
a metal cup-shaped member within which said
disc is seated, a plurality of struck up projec
tions on the bottom of said cup-shaped mem
ber and a corresponding plurality of perfora
tions in said disc, said perforations registering
with said projections but being of smaller diame
ter whereby said disc and cup-shaped member
are locked against relative axial movement while 60
being maintained spaced from each other.
3. A radio tube mount including an electrode
assembly and means to maintain the spacing of
the electrodes, the last-mentioned means com
prising a cup-shaped metal member carried by
the mount, and a mica disc seated within said
member, said member having a plurality of em
bossed projections registering with corresponding perforations in said disc.
4. A tube mount according to claim 3 in which
the embossings have inclined sides and partially
project into said perforations to maintain the
said member and said disc in predetermined
spaced relation.
5. In combination a header, a pair of metal
uprights fastened at their lower ends to said
header, an electrode assembly including at least
one wire wound grid with side-rods, a lower insu
lating spacer member through which said side—
rods project, an upper insulating spacer mem
her through which said side-rods pass, a metal
cup-shaped member fastened adjacent the upper
ends of said uprights, a plurality of embossed
projections on said cup-shaped member register
ing with a corresponding plurality of perfora
tions in said upper insulating member to main
tain the horizontal and vertical spaced relations
between said cup~shaped member and said grid.
6. In combination a header, a pair of metal
uprights fastened at their lower ends to said
header, an electrode assembly including a plu
rality of concentric electrodes, upper and lower
micadiscs through which portions of said elec
trodes pass to maintain the axial alignment
thereof, upper and lower metal collars within
which said mica discs are seated, means to fasten
said collars to said uprights, and means to pre
vent relative shifting between the mica discs and
the collars, the last-mentioned means including a
plurality of embossed projections on said collar
entering a corresponding plurality of perfora 10
tions in said discs.
7. The combination according to claim 6 in
which certain of the electrodes are in the form
of Wire-Wound grids and the mica discs contact
with the end turns thereof.
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