SCIENTIFIC - ELECTRONICS, ELECTRON TUBES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700210095-9
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 11
• Document Creation Date: December 14, 2016
• Document Release Date: January 9, 2002
• Sequence Number: 95
• Publication Date: March 10, 1953
• Content Type: REPORT

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MAR 19b2."
CLASSIFICATION RES?R?"t TED
SB9VFK4P*'i`!Pi ON
CENTRAL INTELLIGENCE AGENCY
INFORMATION FROM
FU'O OFFICIAL USE ONLY
FOREIGN DOCUMENTS OR RADIO BROADCASTS
COUNTRY USSR
SUBJECT Scientific - Elc':tronics, electron tubes .
HOW
PUBLISHED Monthly periodical
WHERE CENTRAL INTELUC^EVE ACL.,CY
PUBLISHED Moscow CLASSIF(L ,'I :I
DATE fzac:;:!
Nov 1952 II:
PUBLISHED Oct
,
LANGUAGE Russian
=s oocwu? con Wins u1-MA11 . . L 9s
25X1A
THIS IS UNEVALUATED INFORMATION
Radio, No 10, 1952, pp 42-45; No 11, 1952, pp CO-63.
NEW SOVIET RADIO TUBES
sables and figures referred to are appended-7
I. MINIATURE TUBES FOR LINE (ELECTRIC) RECEIVERS
In the past 2-3 years, the Soviet vacuum-tube industry has designed several
new types of miniature receiving and rectifier tubes to fulfill the requests of
designers of radio broadcast and television receivers.. These include the three
sharp cutoff pentodes 6Zhlr, 6Zh2P, and 6Zh4P, Type 6K4P remote cutoff pentode,
Type 6B2P remote cutoff diode-pentode, Type 6A2P frequency converter heptode, the
6N1P and 6N2P twin triodes, the 6PiP beam tetrode power amplifier, the 6Kh2P
double diode, and, Type 6Ts4P full-wave rectifier, All these tubes have oxide-
coated cathodes with 6.3-v heaters. In addition, the Type SLIP gas-filled volt-
age regulator is being produced.
All these tubes have "button-type" seven-pin beses (Figure 1), with the ex-
ception of the 6N1P and 6N2P twin triodes and the 6P1P beam tetrode. The latter
have the same type of base with nine "ins. rase diagrams for all tubes de-
scribed in this report, including these list.ed in Part II, "Tubes With Octal
Bases," are given in Figure 2.7 The pins in the seven-pin base are placed around
a circle 9,5 mm in diameter with an arc of 450 included between adjacent pins,
except for the arc between pins 1 and 7, which is 900 (Figure 2): i:, the nine-
pin base, the pins are placed around a circle 12 mm in diameter with an arc of
360 between adjacent pins (720 between pins 1 and 901 The pins of all these
tubes have a diameter of 1-F 0,05 mm and a length of 6 to 7 mm
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The limiting operating conditions of the new rf pentodes are shown in
Table 1 and their normal operating conditions and parameters in Table 2. The
data of several other well-known electron tubes are shown in these tables to
assist in comparative evaluation of the paracutere of the new tubes.
The figures for maximum permissible operating conditions given in Table 1
and the text are established under the assumption that the supply voltages are
regulated. If they are not, the maximum voltages, currents, and power must be
reduced considerably.
Type 6Zh1P Pentodes
This tube is designed primarily for operation In the rf and :f amplifica-
tion sthges of television receivers, where the band width reaches several mega-
cycles. It has high transconductance and low interelectrode capacitances. The
sum of the input and output capacitances in the 6zhlP averages 22% less than in
the 6Zh3P pentode. Therefore, by using the 6Zh1P instead of the 6Zh3P one can
obtain nnnrovieete1;; 15 N gicnber amplification, even though the transconduc-
tances of the two tubes are about the same..
The ratio of the trans conductance to the sum of the input and output caFaci-
tances was increased in the 6Zh1P by reducing the distances between electrodes
and also their surface area. The distance between the first grid and the cathode
is about 60-70 microns. The smaller cathode surface area also reduced the re
quired filament power; at 6.3 v, the 6ZhlP draws about 175 ma in the cathode
circuit, while 300 ma is required for other similar tubes,
The ratio of transconductance to the sum of the in and out capacitances.
expressed in ma/v /?eftfd, is equal to 0.8, which is considerable higher than the
corresponding figures for the 6Zh3P and 6Zh4 pentodes However, actual wide-
band amplifier circuits contain not only the output capacitance of the preceding
tube and the input capacitance of the following tube, but also the capacitance
of the sockets, coils, and resistors and wiring capacitance. All these capaci?
tances must be taken into consideration properly, to evaluate the amplifying
properties of the 6Zh1P pentode. It can be assumed that careful construction
will reduce this additioial capacitance to about 7 f{gfd; the values of the ra
tios S/Cin + Cout -r Co, where C. is taken to be. '7 MAfd, are shown in Table 2.
These values are proportional to the, product of amplification by band width and
therefore may serve for comparative evaluation of the amplifying properties of
wide-band pentode amplifiers. A comparison of these values shows that the 6ZhlP
pentode with S' 5.2 ma/v is equal to the 6Zh4 with S=--r:, ca/v ::her used for
wide-band amplification and can give 15% higher emplificattrn than the 6Zh3P.
The 6Zh1P has two cathode terminals, which is essential for operation in
the ultrashort-wave band. It can be used effectively at frequencies up to
300??350 Mc. In order to reduce the Inductance of the cathode lead, which has a
detrimental effect on.the input resistance of the tube, the second and seventh
pins of the socket are connected together and two or more conductors are con-
nected to the corresponding points of the circuit, A better way using the
two cathode leads is to connect one of them into the plate circuit of the tube
and the other into the grid, This separates the output circuit from the Input
circuit and inc.eanes the input resistance of the tube, At frequencies of 30 Mc
and higher, connection of one cathode lead to the bias resistor and the other
to the by-pass capacitor is incorrect
Small voltage variations on the control grid of the 6ZhIP cause substantial
plate-current variations because of the -tube's large transcondu?:tance. There-
i'rte, it is best to apply automatic bias on its control grid in such a way that
the do negative feedback providec the necessary stability for toe tube's opera..
tion. For plate and screen-grid voltages of 1.20 v, a 200-ohm resistor should be
connected in the cathode circuit to obtain the rrcomm?nded operating conditions .
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Type_6Zh2P Pentode
This tube has much in common ?.iith the 6ZhlP pentode both in internal and
external construction, but the third grid of the 6Zh2P has a separate terminal
so that it can serve as a second control grid. Consequently, the 6Zh2P belongs
to that group of tubes having double control (similar to mixer and converter
tubes). However, it is not recommended for use as a frequency converter at low
signal levels, since its internal noise level is higher than that of other con-
verter tubes. Nevertheless, the 6Zh2P can be used in various other circuits
where the control action of its third grid is desirable, i.e., so that plate-
current changes are accompanied by changes in screen-grid current which are equal
in magnitude and opposite in sign.
Type 6Zh4P Pentode
The trans conductance of the 6Zh4P is close to ti:at of the 6ZhlP and the
6Zh3P, but its output capacitance :Ls larger. The maximum value of through capa-
citance was reduced to 0.005 ufcfA In *_hic tuba by the use of a number of i.n-
cernai shields, including a cylindrical screen encircling the plate. The low
through capacitance and the high input resistance of the 6Zh4P makes for stable
amplification at radio-broadcast frequencies, where the lone resistance reaches
hundreds of kilohms. In addition, the 6Zh4P can also be used for perliminary of
amplification to obtain a gain of 200 or more in a stage.
Type 6K4P Pentode
Type 6K4P remote-cutoff rf pentode, which also has special internal shield-
ing and low through capacitance, is designed for controllable rf and 1-f ampl.ifi
cation in radio-broadcast receivers, including automobile receivers. Structurally,
it differs from the 6Zh4P only in that several ^f t e middle turns in its first
grid have a larger pitch than the rest of the turns. As a result, when the nega-
tive voltage on the control grid increases, the stream of electrons from the cath-?
ode is not cut off immediately, but gradually instead; it is cut off first where
the turns of the grid have the smallest pitch and finally at points where there
is the largest gap between turns. This dependency of plate current and transcon-
ductance upon the bias voltage makes possible controlled amplification and is
useful in automatic volume control,
In such parameters as transconductance, throug.-A capacitance, input resist-
ance, and others which determine the quality of a tub" as a controllable rf ampli-
fier, the miniature 6K4P pentode is as good as the single--ended Type 6K4 pento3.e
and considerably better than the quite satisfactory Type 6K3 single-ended metal
pentode. The 6K4P can be used in radio-broadcast receivers of all classes
Type 6B2P Diode-Pentode
Type 6B2P diode-pentode with remote cutoff is designed primarily for con-
trollable rf amplification followed by diode detection. The pentode section can
also follow the diode section if amplification greater than 25.30 is desire-1,
The parameters of the pentode section of the 6B2P are considerably poorer than
those of the 6K4P, but are better than those u= the 6K3 and considerably better
than those of the pentode section of the 6B8S tube.
We 6A2P Hegtode Converter
In Type 6A2P heptode converter, which has a remote cutoff, the fifth grid
is the suppressor and the second and fourth are screens- Therefore, an oscil-
lator employing a 6A2P should use a Hartley circuit as is the case for the 6A7),
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The limiting filament voltages of the 6A2P in operaticn are 5.7 v and 7.0 v?
The maximum permissible voltages on ?che plate and screen grids and filament with
respect to the cathode are 330 v, 110 v, and ? 100 v, respectively. The maximum
permissible power dissipated by the plate and screen grids is 1.1 watt each.
Typical operating conditions and parameters are as follows: plate voltage,
250 v; screer-grid voltage, 100 v; third (control) grid voltage,- 1,5 v; grid-
leak resistance in the first (oscillator) grid, 20,000 ohms; plate current,
2.9 ma; screen-grid current, 6.8 ma; first-grid current, 0.5 ma; cathode current,
10.2 ma; transconductance, 0.47 ma/v, output resistance, 1 megohm. The maximum
diameter of the tube is 19 mm and the maximum height, 54 mm.
As seen from the above data, the 6A2P ciniature pentode is very close in
operating cc:iditions and parameters to the well-known 6A7 single-ended metal hep-
tode, and even slightly more economical than the latter with respect to current
drain (9.7 instead of 12 ma). The excellent parameters of the 6A2P Justify its
use in electric radio-broadcast receivers of all types designed for AM and FM
reception.
6NlP and 6N2P Twin Triodes
The individual triodes in the 6N1P and 6N2P tubes can be used either in the
same or c.dJacent etages of radio receivers and amplifiers, These tubes are use-
ful for tram'erring from straight to push-pull amplification, for push-pull' pre-
amplifier oLages, and also for saw-toothed line and frame oscillators in tele-
vision receivers? In addition, the 6N1P provides a low internal noise level when
used in the first stages of nighly sensitive television receivers. The operating
conditions of these tubes (with the exception of filament current, is shown in
Tables 3 and 4.
6PlP Beam Tetrode
This tube is designed basically for aucTto-frequency power amplification.
It can deliver up to 4.5 w power in Class A operation and up to 10?.i1. w power
can be obtained from two 6P1P's in Class AB push-pull operation. As seen from
Tables 5 and 6, the 6PlP is very similar in parameters to the 6P6S beam tetrode
and is actually a 6P6S in a miniature design.
6Kh2P Double Diode
This tube has the same external appearance and dimensi.ons as tie 6Zh1P pen-
tode (dma a 19 mm and hmax - 48 mm), The 6Kh2P draws the sake filament power
and has approximately the same interelectrode capacitances as the well-known
6Kh6s double diode, but its transconductance is considerably higher. The diodes
in the tube are well shielded and insulated from each other, the 'maximum permis?-
sible voltage between either cathode and the filament is 330 v. Because of this
factor, the 6Kh2P can be used for various functions, e.. g., for rectification
of an ac voltage when a dc of up to 16 ma is required. However, the 6Kh2P is
designed primarily to detect FM signals in a discriminator or partial detector
circuit. With its high transconductance, the 6Kh2P double di.ode operates well
as a video signal detector. The natural resonant frequency of the diod:-e is
about 700 Mc,
6Ts4P Double-Anode Rectifier
The maximum diameter of this tube is 19 mm and the maximum beight, 62 mm.
The 6Ts4P rectifier is designed for use in second-class line receivers and also
in automobile receivers, Since in the latter case the filament ,.s supplied from
a storage battery, the electrical strength of the cathode insulation must oe
high; the maximum permissible voltage on the cathode with respect to the fila-
Sent is 450 v. The maximum permissible peak inverse voltage is 1250 v and the
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maximum e-verage rectified current, 70 ma, The filament curr-nt of the 6Ta4P 1s
0.6 a at . ,3 v. In its typical operation as a full-wave rectifier, an ac voltage
of up to 325 v is supplied to each plate,. Then, with a maximum rectified current
of 70 ma and a resistance of the dc choke of 150 ohms, the dc voltage at the fil-
ter output will be about 360 v. The 6Ts4P is a miniature analogue of the 6Ts5S
rectifier.
Type SG 1e. Voltage Regulator
The maximum diameter is 22,5 mm and the maximum height, 72 mm. The basic
data of the regulator are as follows maximum firing voltage, 180 v, working
voltage, 150 v; minimum current through regulator, 5 ma, and maximum, 40 ma. Be-
cause of the smaller volume occupied by the gas, the SG1P i.a not quite as good
as Type SG4S 150-v regulator with an octal base.
IT_ , TUBES WITS.C~T,".I. D- EC
New glass tubes with octal bases include the following, the 6P7S beam
tetrode, the 6N5S twin triode, and the high-voltage rectifier 1Ts7S. The first
two tubes are the most powerful of a number of new receiving.-amplifying tubes and
therefore cannot be made in the miniature form. With regard to the rectifier, it
was found necessary to remove the plate lead from the cathode leads by a consid-
erable distance in connection with the high inverse voltage- This necessitated
the use of an octal base and the arrangement of the plate lead on top of the
envelope.
6P7S Beam Tetrode
This tube has an oxide-coated indirectly-heated cathode and is designed
primarily for operation in saw-toothed oscillators or in the output amplifiers
of television line-scanning units. The plate lead is placed on top of the tube
because voltages of several Icy are developed at the plate in such circuits dur-
ing flyback. The maximum operating conditions of the 6r7S beam tetrode are
shown in Table 5 and he typical operating conditions and parameters, in Table 6.
As seen from these tables, the 6P7S has the same parameters as the type. 6P35
beam tetrode and differs from the latter only in its ability to withstand short-
duration peak voltages of up to 6 kv on the plate. The power delivered by the
6P75 is sufficient to obtain full beam deflection in Type 18L?Q5, 23LKIB and
31LKlB kinescopes,
6N5S Twin Triode
This tube also has an indirectly-.heated oxide-coated cathode. The maximum
and typical operating conditions and parameters for the tube are given in Tables
3 and 4., The 6N5s is distinguished by its exceptionally low internal resistance
which was obtained by increasing the surface area of the cathodes, by using a
small separation between plate and cathode, and also by the use of grids with a
widely-spaced winding. One of the major uses of the 6N5S is as a television
dam;'ing tube to suppress the damped oscillatory process arising in the coils of
the line-scanning system when flyback starts and also to im--rov_ the linearity
of horizontal beam deflection-
The tube can also be used for audio-frequency power ampliftest- on in hi.eh
quality devices. One 6N5S triode can deliver up to 10 watts' power with a har-
monic content not exceeding 2%? Finally, this tube with its low output resis.-
tanee can be used as a variable resistance in electronic voltage regulators.
In such units, the control tube must pass high currents with a comparatively low
voltage drop between plate and cathode. If one 6pr5s tube is used in this type
of regulator, the output voltage of the rectifier can be adjusted from 0 to 250 v
and held stable when the current drain varies from 0 to 250 ma.
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Type 1Ts7S High-Voltage Rectifier
This rectifier is dc3igned for rectiflcaGion of the high voltage used for
supplying the anodes of cathode-ray tubes. It has a directly-heated oxide-coated
cathode. Because of the economy of this cathode, the output of the line-scanning
saw-toothed oscillator or the rf oscillator can be used to heat it. The data of
the 1Ts78 are as follows: filament voltage, 1.25 v; filament current, 0.2 a;
plate-filament capacitance, 1.6,ej1Afd; maximum permissible peak inverse voltage,
30 kv; maximum permissible peak rectified current; 17 ma; maximum average recti-
fied current, 2 ma. The above data holds when the rectifier is supplied with
a voltage of 300 kc maximum frequency. Any voltage necessary for supplying the
18LK15, 231MB, and 31 LKLB kinescopes up to 15 kv can be obtained from a half-
wave rectifier circuit using the 1Ts7S. Still higher voltages can be obtained
by connecting two 1Ts7S rectifiers in a voltage-doubler circuit.
The 15 tube types for radio-broadcast and television receivers constitute
a very good addition to the already existing assortment of receiving-?amplifying
tubes and should make possible a considerable improvement in th-.-+~e1_t; cf.
widely-`anal r.dic .. .... .
_ ._..,, equipment.
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Electrical Quantity
Maximum filament
voltage
Minimum filament
voltage
Maximum plate volt-
Maximum screen-grid
voltage
Maximum filament-to
cathode voltage
Maximum power dissi-
pated by plate
Maximum power dissi-
pated by screen grid
Maximum cathode cur-
rent
Table 1. Limiting Operating Conditions for RF Pentodes
Unit 6zh1P 6zh2p 6Z*-.3 6Zh3P 6zh4 6zh4P 6K4P 6zb8 6B2p 6
K3 6K4
v 7.0 7.0 6.9 6.9 6.9 7.0 7.0 7.0 6.9 6.9 6.9
v 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7
v 200 200 330
150 150
100 100
1.8 1.8
330 330 330 330
165 165 165 140
Table 2. Typical OFera;,ing Conditions,
Electrical Quantity- Unit 6Zhl, 6Zh2P 6zh3
FilamenF voltage v 6.3 6.3 6.3
Plate voltage v 120 120 250
Screen-grid voltage v 120 120 150
Control-grid volt-
0.55 0.45 0.7
14o 14o 140
100 100 100 100 100
Parameters, andDimensione of RF Pentodee
6Zh3P 6Zh4 6Zh4P 6K4Y 6Zh3
6.3 6.3 6.3 6.3 6.3
250 300 250 250 250
1.1 4.4 3.3
-- 0.44 0.7
6s2P 6x3 6x4
6.3 6,3 6.3
250 250 250
100 100 100 1-25
-3.0 -3.0 -3.0
X
LO
N
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Table 2?(Contd)
Electrical Quantity
Unit
6Zhip .
6 Zh2P
62h3
Cathode resistance
ohms
200
200
--
Filament current
ma
175
175
30)
Plate current
ma
7.5
5.5
1C.3
Screen-grid current
ma
2.5
5.5
4.'1
Transconductance
ma/v
5.2
3.55
4.9
Output resistance
megohms
0.3
0.075
0.9
Rated.in capacitance
ff,fd
4.3
4,3
8.5
Yax. through capaci-
tance
14 fd
.02
_m
M7
Rated out capacitance
A fd
2.2
2.3
7.0
Ratio S/ (C1 n C out)
ma/v./$fd
.80
.54
.32
Ratio S/(cin C *))Co
Co 7~"fd out! ma/"A fd .39
.261
.22
Maximum diameter
mm
19
19
34
Maximum height
mm
48
48
67
A Automatic: bias:
6Zh3P
6Zh4
6Zh4P
6K .P
200
160
68
68
300
450
300
3010
7.0
!0.0
7.2
10,5
2.0
2.5
2.6
4.0
5.0
9.0
4.7
4.'
0.8
1.0
1.0
0.13
6.5
11.0
5.3
5.2
.025
.015
.005
1.8
5.0
5.0
.6o
.56
--
.33
.39
.26
--
19
34
19
19
54
67
54
54
.005
7.0
.13
.08
34
67
6B2p
6x3
6x4
300
?00
300
6.6
9.2
11.8
1.6
2.6
4.4
2.7
2.0
4.7
0.7
0.8
0.9
4.2
6.o
8.5 ,
.02
.003
.005
.4.1
7.0'
7.0
--
--
19
34
34
54
67
67
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Table 3.
Limiting Operating Conditions of Twin Triodes
unit
6kP
6N2P
GNSS
6Ni5P 6188.
6N9s
Maximum filament
voltage
v
7.0
7.0
6.9
6.9 6.9
6.9
Minimum filament
voltage
v
5.7
5.7
5.7
5.7 5.7
5.7
Maximum plate
voltage .
Maximum filament-
to-cathode voltage
? v
250
?--100
300
100 100
100
Maximum power dissi-
pated by plate
w
2.0
1.0
13
1.6 2.75
1.1
Maximum cathode
current
ma
25
10
125
Table. 4.
Typical Operating Conditions, Parameters,
? abd)Dimenaions of Twin Triodes
Quantity
it
6N32
61C2Y
6N5S
6N15p 6N8s
6N93
Filament voltage
v
6.3
6.3
6.3
6.3 6.3
6.3
Plate voltage
v
250
250
135
100 250
250
Grid voltage
v
--
-1.5
--
-- 8
-?
Cathode resistance
ohms
600
--
250
100
--
Filament current
ma
600
300
2500
450 600
300
Plate current
ma
8
2.3
110
9 9
2.3
Tranaconductance '
ma/v
4.3
2.0
6.7
5.6 2.6
1.6
Amplification factor
--
35
100
2
38 20
70
Internal resistance
kilohms
8
50
0.3
6.8 7.7
43.
Maximum diameter
mm
22.5
22.5
53
19 34
34.
Maximum height
mm
57
57
137
54 54
54
Table 5. Limiting Operating Conditions of Beam Tetrodee
Electrical Quantity Unit 6Pii 6P 3S 6F68 6P7S 6P9
Maximum filament voltage v 7.0 6.9 6.9 6.9 6.9
Minimum filament voltage v 5.7 5.7 5.7 5.7 5.7
Maximum plate voltage v 250 400 350 500* 330
Maximum screen-grid voltage v 250 300 310 350 3.30
voltage :Lv 100 100 100 135 100
9
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Table 5 (Contd)
Electrical Quantity
Maximum power dissi-
pated by plate
Maximum power dissipated
Unit 6P1P 6pS 6P6S 6P7s 6P9
by screen grid w 2.5 2.75 2.2 3.2 1.5
Maximum cathode current ma 70 -- -- -- --
*Maximum peak voltage is 6000 v.
Table 6. Typical Operating Conditions, Parameters,
and Dimensions of Beam Tetrodes
Electrical Quantity Unit 6Pii 66P3S 6P6z 6P7S 6P9
Filement voltage v 6.3 6.3 6.3 6.3 6.3
Plate voltage v 250 250 250 250 300
Screen-grid voltage v 250 250 250 250 150
Control-grid voltage v -12.5 -14 -12.5 -14 -3.c
Filament current ma 450 900 450 900 6 o
Plate current ma 45 72 45 72 30
Screen-grid current ma 5 8 5 8 7
Trans conductance ma/v 4.5 6.0 1+.1 5.9 11.7
Internal resistance kilohms 50 30 5.0 30 130
Load resistance kilohms 5 2.5 5 -- 10
Output power w 4.5 6.5 4.5 3
Earmonic content % -- 10 8 -- 7
t'aximum diameter mm 22.5 46 34 52 4
Maximum height mm 72 109 85 145 83
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n d
HB ce as Dimensions
of Miniature Tubes I
Figure 1. External
A eara
62ti4p`," 6K4P '
6T .4i
Figure 2. Tube Base Diagrams
6N2P
I
Approved For Release 2002/08/06 : CIA-RDP80-00809A000700210095-9