TECHNICAL DATA ON OSW CATHODE RAY TUBE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP83-00415R000500090040-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 17
• Document Creation Date: December 21, 2016
• Document Release Date: January 28, 2009
• Sequence Number: 40
• Publication Date: December 4, 1947
• Content Type: REPORT

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194
Ann
The a
*a the WW Cathode 25X1
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Hi_,h Performance Cathode Ray Tube
Type OSK 2066
Oberspreewerk
Berlin - Oberschoeneweide
Ostenstrasse 1 - 5
TABLE OF CONTENTS
I. Statement of the Problem
II. General Constructional Criteria
III. Systems Construction
IV. Pumping and Forming
V. Placing in Operation
VI. Experimental Results
VII. Technical Data.
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Content: Copy of the Construction and Experimental Report for
the High Performance Cathode Ray Tube Type 0& 1'2066
Developed in the Period May 8, 1945 to June 1946.
The High Performance Cathode Ray Tube, ob-A 2066, was
developed at O.S.W. during the first half of 1946 as an improvement
on the earlier AEG and Siemens types. The tube fulfills the require-
ments of the original problem. The tube is of national economic im-
portance. After October 22, 1946 GSa - Berlin will no longer construct
this pattern. The general production and eventual further development
will be transferred to the U.S.S.R. after this date.
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High Performance Cathode Ray Tube OS992066
I. Statement of Problem
The problem of building a high performance tube similar to the
AEG Type HRP 1/130/20 or the Siemens Type E115 was presented:
The first step planned was the Type 2066 with a writing speed of 20,000
25X1
km/sec at 20 kV anode potential. Another problem should take up from here
to develop higher writing speeds.
II. General Constructional Criteria
Realizing that at anode voltages of 20 kV the AEG type presents
no happy solution to the problem because of its many corners and points
and that, on the other hand, the complicated glass technique employed in
the Siemens construction is just as uninviting, we decided to employ a
new design. The foundation chosen was a four ceramic brace system, the
parts however are made according to a new design. The individual elec-
trodes are comprised of one or more drawn screening pails, so constructed
that they may be centered by theirflanges in a centering jig. Clips,
so oriented that their tabs point to the corresponding electrode, are
used to fasten these pails. In this way corona at their tips is re-
duced. The use of pin contacts in the pressed base as well as the neck
of the tube makes for a simple and low capacity type of construction.
The mechanism is so well supported by the pins that the spring rim used
in the AEG tube, which unfortunately raised the capacity, is replaced by
four springs mounted on the brace members and making contact to the
(carbon) black coating on the wall of the tube.
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The electron-optical system of the GSV 2066 is a so-called
screen grid system. The electrons emanating i.rom cathode K pass through
the opening of the pail-like control grid, gl. This electrode acquires
a slightly negative bias with respect to the cathode. Following the
control grid is the screen grid, g2, whose function is to draw electrons
out thru the control grid. Next, is the lens forming electrode al,
which is built in the form of a cylinder and which has an iris at the
front end. This iris has the function of collecting electrons which
have departed too far from the ray center. These would produce a large
fuzzy spot on the screen. By using a screen grid between the lens form-
ing electrode, al, and the control electrode, gl, a change of beam current
with changes in the focusing voltages is prevented. Electrode g2 is
kept at a high potential, whereas, electrode al has a somewhat lower volt-
age. Following the lens form ng electrode, al, is another cylindrical
electrode a2 of larger diameter. The major focusing action takes place
between electrodes al and a2. The focusing of a beam onto the screen
is essentially dependent upon the potential difference of electrodes al
and a2. The essential difference of this kind of optics is the rela-
tively larger diameter of the lens forming electrode in the region of the
main collecting lens as compared with earli^r high performance tubes.
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In regard to the deflection system two important requirements
must be considered. The signal deflection plates must be decoupled
from the lens system electrodes and the ot: er set of deflection plates.
In addition the leads to the signal plates must have a minizmun of asso-
ciated capacitance and inductance. To fulfill the first requirement,
a large screening iris (shutter) which was to be at anode potential was
brought in front and behind the signal deflection plate pair. For
lead-in wires to the deflection plates, pins were sealed into the neck
of the tube, to which contact was made by springs as the mechanism was
pushed into place in the tube. Accordingly, the leads become very short
and unnecessary stray capacitance and inductance is avoided. The
dimensions of the deflection plates were so chosen that the total screen
was covered without. appreciable distortion due to deflection error.
In order to remove errors due to the fringing field slit
irises were installed at the input and outlet edges of the signal
plates and at the input edge of the time base deflection plates.
III. System Construction.
The system is constructed on a hard glass pressed base con-
taining sealed-in tungsten pins (see Drawing R23-03).. It consists of
the cathode structure with control grid pail and screen grid pail and
the electron optical system including the deflection plates.
(a) Cathode structure.
The essential parts of the cathode structure (see Drawing
R23-05) are the cathode itself, with the control grid pail and the screen
cathode
grid pail inside which the t'rst is mounted.
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)L(KtI
The cathode contains a heater, 2 for 6.3 made of a
drilled-out tube formed into a spiral and covered with an insulating
paste of aluminum oxide. The leads to the filament are fastened to
tube rivets, which are fastened to a ceramic disc with lock washers.
The cathode consists of a small tube to which is welded a little hat
which carries the emitting paste. The cathode tube has two flanges
which are welded to springs. These springs clamp the cathode tightly
to the supporting ceramic plate even though it is warped under alter-
nate heating and cooling. A second ceramic plate is used along with
the first to align and hold the cathode tube. The two ceramic plates
(Ergan) are spaced by a ring. The ceramic plates are machined to fit.
The above described cathode is mounted in the control npail""
[grid) which is made of two welded parts,,3 and 4. The cathode is
fastened to inwardly bent tabs on the control grid's lower member, 4.
The alignment and anchorage of the cathode system (see
Drawin: F. 23.0305) in the screen grid pail, 2, is accomplished by the
use of two ceramic discs 3 and 4 (Loetceramic) which are prevented
from slipping; out by three nubs. Disk number 3 is ground on both
faces and on the inner and outer rims since it is used to center and
space the control and screen grids.
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Disk number 4, consists simply of pressed unfinished ceramic.
With reference to the machining of the control grid pail it is important
that the iris be highly polished and absolutely free of foreign matter.
Furthermore the hole in the screen grid iris must be clean and free of
grit. The control diaphram (iris) has a diameter of 0.85 mm and is
located 1 mm from the screen grid diaphram'which has a k mm diameter.
(b) Lens System
Beyond the screen grid at a distance of 2 mm is the lens
electrode which consists of 4 diaphram-pails 9, 3, 10 (see Drawing
R.23.03). The entrance iris has a diameter of 10 mm, the exit iris
has a diameter-of 26 nm. The length of the electrode is 57 mm. The
two "getters containers are fastened to the exit iris. Each contains
two Bato-getters. At a 10 mm distance frompail number 10m there is
an anode iris, 11, having a diameter of 10 mm, which along with the
former produces the main focusing, (concentrating) field for the beam.
Letween the anode pail 11 and the iris pail 13 there is the aperture
iris, number 12, located 8 mm from the anode iris and having a 3 mm
diameter.
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(c) Deflection System
The iris pail, 13,, has a rectangular cut, which corresponds
to the lower edge of the deflection pair, 14. The springs 4 and 5
serve as leads to these deflection plates. They are fastened to them
with special holders. An iris, 15, having a rectangular slit lies next
to the exit of the first pair of deflection plates. This iris carries
spring number 6, used as lead to the anode. An iris pail, 16 is welded
to iris 15, which (pail) acts as a slit iris for the second pair of de-
flection plates, 17. Finally, the springs, 18, are fastened to the outer
ends of the ceramic braces. These are connected with the irises 15,
16 and 11, 12, 13 all of which are at anode potential. These springs
serve, on one hand, as spacers for the system and the wall of the tube
as well as a connection between the anode and the (carbon) black deposit
on the wall of the tube. Copper-nickle wires 19, 20, 21 and nickle
bands, 30 serve as leads from the pins in the press to the spring con-
tacts. Similarly, the two anode systems are connected by a nickle
band, 22.
(d) Fluorescent Screen
The fluorescent screen is circular and flat. It is covered
with one of the phosphors manufactured by Leuchstoff G.M.3.H.' of Steinbach,
coded H-3 white-blue. This substance has a certain percentage of zinc-
selenite which insures that at 20 kV the secondary emission factor is
greater than unity, which avoids building up a charge on the screen. The
phosphor is fastened to the surface of the glass by the help of an alco-
holic phosphate solvant by the well known "Perl" (bead) method..
Sprar
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The color of the phosphor is a blue-white at the operating voltages
and currents and lends itself to photographic purposes.
(e) (Carbon) Black Coating
The walls of the tube are coated with a film of electro-
graphite, which had been ground and floated on water glass. The graphite
coating has the same potential as the last electrode a2. It is necessary
to conduct the electrons which fall on the scree* away, in order that
the screen will not become negatively charged and hinder the arrival of
the electrons in the beam. The discharge is performed by the graphite
film which collects the secondary emission electrons from the screen as
well as those which manage to leak across the 5 mm wide strip of un-
coated glass between the screen and the graphite coating. Furthermore,
the coa king prevents charging of the glass wall of the tube by stray
electrons.
IV Pumping and Forming
The best possible vacuum must be obtained during the pumping.
and heating procedure. At the maximum temperature of 415?C..the vacuum
must be at least 16-6 mm Hg. After cooling the thusly evacuated tube
the cathode is transformed, i.e. by heating, the carbonate of the enis-
sion paste is transformed to an oxide. Next the getter is flashed?
and, finally, the formation or activation of the emitter is undertaken.
Along with this, high voltages are applied between those electrodes
which will have high operating potential differences, such as between the
anode and the lens forming electrode. This is done to avoid the possi-
bility of eventual dielectric breakdown.
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Finally the tube is put into operation and the screen is scanned by
the beam to eliminate the residual gas in it. Then the getter is
activated and the tube is sealed.
V. Placinz in Operation
When placing the tube in operation it must be carefully
observed that the cathode has reached its normal operating temperature,
which is achieved in about 25 sec. of heating. Then the other elec-
trode potentials may be applied. It is necessary to observe the
ratings given in the data sheet if the tube life and sensitivity are
not to be curtailed. Fixed, for example, synchronized figures etc.
may not be produced at the rated current. A maximum of 5 kJ may be
applied to the screen grid. At anode voltages less than 5 kV, Egg
is taken as equal to Ea. The-screen grid and lens electrode are so
constructed that they accept no current. The prescribed cathode
current is adjusted by changing Eg1.
VI. Experimental Results:
(a) Resistance to Voltage Breakdown
Investigation showed that a pulsed d-c voltage of about
25 kV between the lens system and the anode, the normal operating volt-
age difference is only 16 kV, caused no?ionization or voltage bread.
down.
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If the electrodes lying beyond the lens are tied together, and
those lying before the lens, direction taken in the sense of the elec-
tron beam, are tied together and the above mentioned 25 kV potential
is applied, the whole system shows no ionization or voltage breakdown.
(b) Deflection Sensitivity
The deflection sensitivity of the tube at an anode potential
of 20 kV is 0.05 mm/V at the signal plates and 0.04 mm/V at the time
base plates. The capacitance of the signal plates to each other is
about 1.6 pF (uuf?) whereas the timing plates have a capacitance of
1.7 pF. The capacitance between the two systems is negligible because
of the screening.
It is 1.1 x 10-2 pF.
(c) writing Speed
The writing speed of the tube was determined photographically.
As there was neither an optical system available such as was used with
the AEG tube to give 50,000'km/sec writing speed, nor an emulsion of
corresponding sensitivity,-the writing speed had to be approximately
determined. An optical system 1:1.8 [f number ?J and commercially
available movie film were used in making the photographs. Calculations,
taking into account the unfavorable methods of measurement (photographic),
gave a writing speed of at least 20,000IQn/sec. Hence the aim of the
development was fulfiw:e d.
Enclosures: 5 Drawings
R 23
R 23
(l,a)
R 23
? 03
R 23
- 05
R 23
? 0305
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VII. Technical Data
Technical Data on the High Performance Cathode Ray Tube Type OSV 2066
___________Anode Voltage 20kV___________ _
General:
Deflection: double electrostatic
Screen color: blue-white
Coating: no after glow (low persistance)
Screen: circular and flat
Cathode: Heater potential Ef - 6.3 V (5.4 - 7.2V)
Heater current If I" O-5A
Oxide cathode, indirectly heated.
Capacitances:
Cathode with respect to all other electrodes Ck = 4.5pF
Grid
N N
11
N,
N
N
Cg : 6.5
Mil
N M
N
M
N
N
Cm1 4.5
Zl
N $
N
M
N
M
CZ1 = 5.0
Zl -
N tt
N
Z2
Czl/z2 = 1.7
Ml
n N
"
M2
Cm]Jm2 '= 1.6
Zl
it it
n
M1
Cz1/ml :.011
The electrodes, not concerned are grounded or put at the bridge neutral
point in the measurement system.
Vibration strength at 1mm amplitude s 2g.
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Anode voltage
Screen grid voltage:
Signal plate voltage:
Timing plate 'oltage :
Cathode current :
- 12 -
Ratings
Eat 20 kV
Egg = 5kV
Vm - 800 V at 500 cycles
Vz 800 V at 50 cycles.
Ik 30 uA (Egl is regulated to give this value)
The lens voltage amounts to:
The line width is
The writing speed is
Anode voltage
Lens voltage-
Screen grid voltage :
Cathode current :
Eal=3.4to4.6kV
B 0.5 mm
20,000 km/s
Deflection Sensitivity
Eat = 20 kV
Eal = optimum
Egg= 5 kV
Ik = 2uA (Eel is regulated to give this value)
The signal plate sensitivity is : 0.05 W/V
The timing plate sensitivity is : 0.04 mm/V
Anode voltage
Lens voltage
Screen grid voltage:
Cathode pulse current
Pulse time
Duty cycle
Values at Pulse Operation:
Eat = 20 kV
Eal - optimum
E92 - 5 kV
Ik = 1000 uA (Eg1 is regulated to give this value)
10-4 sec.
-T-- = 1:1000
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The line width is :
Anode voltage
Lens voltage
Screen grid voltage :
Cathode current
Scanning area (Raster)
Brightness value
- 13 -
B= 1 mm
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Brightness:
Ea2 - 20 kV
Eal - 4 kV
Egg = 5 :V
Ik = 15 uA
30 mn x
= 0.25 HK
Laximum Values:
Anode voltage Fat = 22 KV
Lens Voltage
Screen grid voltage :
Grid blocking voltage :
Grid voltage
Signal peak volts
Timing peak volts
Cathode current
Heater - Cathode voltage
Eat = 5 kV
Bgg=5kV
E~SF'r,nb' -200 -V
Egl = OV
Vmsp = 2 kV
VzsP = 2 kV
Ik = 1500 uA
Ef/k =100V
Allowa%le Deviation:
blocking voltage (Grid voltage Egspez,r, = -200 to -100 V
at Ea2 = 20 kV, Sal = optimum, Egg - 5 kV
Vm - 800 V (500 cycles), V. = 800 V (50 cycles)
the decay of the picture is watched with the
anode current cut off)
unaided eye.
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Cathode current Ik = 1500 uA at Ea2 = 20 kV
Eal = 2 kV
E92 - 5 kV
Egl =800 V
Viii =800 V (500 cycles)
VZ =800 V ( 50 cycles)
-~-- = 1074 sec.
1:1000
Center deviation:
The focused but tndeflected spot lies within a circle of
15 rm (diameter ?), lying at the geometric center of the tube's screen.
In this measurement care rust be taken to screen the tube
f rota all stray fields.
Axis deviation:
The plane through tube axis and pin A may deviate from the
line produced by the deflection plates Z1 and Z2 by an angle of 10?.
The deviation from 90? between the lines produced by the pairs Zl, Z2
and 14, Y2 may be 5?.
Drawing with dimensions : Socket connections
(See p. 15)
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1300
Dir.wrnr: of socket cc.r:ections
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