TESLA VRSOVICE PRODUCTION OF MEDIUM AND HIGH-POWER TRANSMITTER TUBES AND MEDIUM-POWER SPECIAL TUBES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP82-00046R000300190018-9
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 15
• Document Creation Date: December 23, 2016
• Document Release Date: May 31, 2013
• Sequence Number: 18
• Publication Date: February 26, 1954
• Content Type: REPORT

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COUNTRY
S:.-- 7iTY
Czechoslovakia
50X1
SUBJECT Tesla Wsovice Production of Medium
and High-Power Transmitter Tubes and
Medium-Power S ecial bes
DATE OF INFORMATION
PLACE ACQUIRED
THIS IS UNEVALUATED INFORMATION
REPORT
50X1
DATE DISTR. a% 41, .54
NO. OF PAGES 15
REFERENCES:
50X1
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1. Tubes in the categories of medium and high-power transmitter electronic
tubes and medium-power special electronic tubes were produced during
World War II in small series b Radioslavia A.S., Prague-Vysocany (I
do not know the street address). This plant was demolished in the
second bombing of Prague in 1944. The production of these tubes was
resumed in 1947 in a new Radioslavia factory in Prague-Vrsovice, at
SNB Allee #55. From 1944 to 1947 these tubes were not produced in
Czechoslovakia at all. Only so-called "repairs" were carried on during
this period. Defective tubes were disassembled, the good parts being
used to produce a new tube. When sufficient parts were lacking to
produce a new tube, these parts were produced in the factory. This
repair operation took place in Philips A.S. in Prague-Hloubetin (later
the Tesla Hloubetin II plant). The only exception was DET-3; this tube
wss actually produced during this period in the Philips plant. The
Radioslavia firm in Prague-Vrsovice was nationalized in 1948 and
renamed Tesla. The present name of this plant is Tesla National Enter-
prise, Vrsovice Plant. The factory was subordinated in the second half
of 1951 to Tesla National Enterprise, Julius Fucik Plantjin Prague-
Hloubetinj at y186 Podebradska Street. The Tesla Vrsovice factory is
the only plant .) Czechoslovakia for the production of medium and high-
power transmitter electronic tubes and of medium power special elec-
tronic tubes, 1" The tubes were actually produced in this plant,
almost all of the comp.- -:It parts being produced and assembled there.
'41
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These types of tubes were not imported into 'Czechoslovakia after 1945.
I believe that they were also not imported before 1945. In general,
these Czechoslovak tubes conformed to the products of 'the English firm,
MaroOni Wireless Telegraph Company, London. (The initial Czechoslovak
production in thie field, during the last years 'before World War II,
was licensed production of this English firm. The Czechoslovak tithes
of this type still carry Marconils designation, and electronic tubes
later developed were marked with similar designations i) The production
output of these tubes for 1947 was About one tenth of the 1951 output..
The first increase in output was after the Radioslavia factory was
nationalized in 1948; the second increase was in 1953. Production
figures for individual tubes are given below for 1951, 1952, and 1953.
The production figures for 1951 and 1952 are planned figures Which, if
not' stated otherwise, were actually achieved, while the production
figures for 1953 are planned figures, but are here accompanied with
production figurers which I believe could be achieved (when the two
figures differ).
3. Prices are given for individual tubes. These are pre-currency-reform
prices and the present price equals that price divided by five. There
were rumors in the Toole Vrsovice plant that the price of some types
of tube... would' be lowered in 1953, but as of summer 1953, the prices
had not changed. Further, the percentages of rejects are given for
individual tubes. The percentage represents the average for 1952 and
the first half of 1953.
Prior to the nationalization in 1948 the quality of these Czechoslovak
tubes reached about 90 of the quality of the Marconi products. Since
that date the quality of tubes has been deteriorating steadily, as
reflected in the actual life of individual tubes. In general, the actual
life of the tubes was 200 of the guarantee( in 1948, 170% in 1949,
ltr in 1950, 125% in 1951, 95% in 1952, and in i953, believe, only
8 of the guaranteee. The guarantee:: is given ielow for the.indivi
dual tubes. When not stated otherwise, the actul life of the tube
maybe judged from the percentages of the guarantee as given above.'
The continuous decrease in the quality of tubes was for the most part a
direct result of Communist production and personnel policies. These
policies, along with the general r-Atioal and economic situation,
resulted in deteriorating labor morale, whioh was reflected in negli-
gence and lack of interest, and from 1951 unorganized sabotage. The
decrease in the, quality of tubes was further caused by deteriorating
quality of both foreign and domestic raw materials. Because the imports
frwthe West were, in general, limited, the plant was obliged from
1949 to purchase often from new foreign suppliers and therefore was
unfamiliar with the materials. Further, the foreign materials which
arrived in Czechoslovakia by devious ways, mainly beginning in 1951,
were very often of a poor quality. The materials in question were
mainly tungsten and molybdenum. The growing lack of foreign materials
forced the Vrsovice plant to use domestic material where it was avail-
able. This domestic material was of poor quality because Czechoslovak
suppliers were not experienced enough to produce materials for vacuum
tube production.
Following is a complete list of medium and high-power tram:sitter
electronic tubes and medium-power special eleotronic tubes-4
5. Blflotronic tubes with internal anode and natural cooling:
a. NT electronic tubes:
N designates the tube as tube with tungsten cathode and natural
cooling; T lesignates the tube as triode.
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6BUILET
liMT 12A
MT 14-
MT 9
MT 9A
3 MT 9F
4 MT 9L
2 MT 12
The actual output
MT 14 was 30 units for
1951 and 120 units for
1952.
-3-
Planned Output
for 1951 for 1952 for 1953
7 units 14 units 62 units
8 units 15 units 10 units
13 units 34 units 26 units
36 units 33 units 22 units
7 units 16 units 4 units
0 units 8 units 9 units
65 units 250 units 132 units
of the
All of the MT electronic tubes were of a similar design. They
differed only in electric performance characteristics, which
however, Were within the range given below.
Heater voltage
Anode voltage
Anode dissipation
Cathode
Anode
Glass
Grid
Guarantee
Rejects in production
Returned by customer as
. defective (hereafter called
"returned")
Price
15-20 v.
2,000-6,000 it. with one
exception, which was
10,000 V. for MT 9 or
MT 12, I do not remember
which.
200-600 watts
Tungsten, directly heated
enum
Lee glass. Molybdenum
gla.zs was used for, the
MT 14 type from the second
,half of 1951.
Molybdenum
2,000 hours
40%
15%
About 10,000 crowns
The vacuum of MT tubes became imperfect when the tube was in opera-
tion. This was caused by inadequate cooling'. The MT 14 rejects, for
this cause, amounted in 1951 to 80% of the total MT 14 output; there-
fore in 1952 the tube was equipped with molybdenum glass envelope
instead of lead glass. The MT 14 type was the most used of these
tubes. It was used for various purposes in recent types of trans-
mitters (transmitters set. in operation in Czechoslovakia after 1945)
and for transmitters which were being constructed. Six per cent of the
total -yearly output of this tube were shipped for use in the Warsaw'
Transmitter. This transmitter was built in 1949 by the then Tesla
Vrsovice'Transmitter Department and, I believe, had about 100 kw. of
power. The remaining MT tubes were used for various purposes in old
transmitters (transmitters which were in operation in Czechoslovakia
before 1945). These were of lower power (about 20 kw.):.and were
located at Jihlava, Ike Budejovice, and Podebrady 5 50-09, E 15-0g7.
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b. MR electronic tubes:
M designates the tube aattdikeLiwitImpagirten calth04646.1 datOral,cooling.
R designates the tube_ as rectifier diode (vacuum)
Planned Output
1951 1952 1953
(8)
MR 4
-0-units 60 units 17 units
Actual 1952 output was 30 units.
Price 3,300 crowns
(9)
MR 6
7 units 4 units
8 units
Price 3,700 crowns
(3.0)
MR 7A
55 units 96 units
69 units
C. DE
MR 4 and MR 6: Heater voltage
Anode voltage
Anode dissipation
Cathode
Anode
Rejects
Returned
MR 4 guarantee
MR 6 guarantee
mR 4 and MR 6 tubes were used for old
MR 7A
Heater voltage
Anode voltage
Anode dissipation
Anode
Cathode
Glass
Guarante
Rejects
Returns
Pride
Up to 15 v.
4,000 v.
200 watts
Tungsten, directly heated
Molybdenum
30%
5%
1,500 hours
2,000 hours
transmitters of lower power.
15 v.
Abou 6,000 v.
400 watts
Molybdenum
Tungsten, directly heated
Lead glass
2,000 hours
25%
5%
5,500 crowns
This tube was used for both old transmitters of lower power
(more frequently used than the MR 4 and MR 6 types) and for
transmitters constructed betweeen 1945 and 1948.
The MR tubes developed the same defect as the MT tubes.
electronic .tubes:
DE designates the tube as tube with internal anode, natural cooling,
and tungsten-thorium cathode.
M designates the
designates the
? rl13 DEM 2.
12 DET
DET
tube as modulator triode,
tube as oscillator triode.
Planned Output
1951 1952
-0-units 7 units
8 units 6 units
45 units 130 units
The actual outpAt for 1952
was 100 units.
SECRET
1953
6 units
16 units
100 units
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DEM 2 and DET 2: Heater
Anode voltage
Anode dissipation
Rejects
Returned
Price
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15 v.
2,000 v.
100 watts
69%
10%
I do not remember
The DEM 2 and DET 2 were used in old transmitters which were
operating in Czechoslovakia.
DET 3:
Heater
Anode voltage
Anode dissipation
Rejects
Returned
Price
This tube was used for old transmitters and
built between 1945 and 1948.
The DEM 2, DET 2, and DET 3 types were equipped with tungsten-thorium
directly heated cathode, molybdenum anode, and molybdenum grid; the
envelope was of lead glass. The guarantee for all these tubes
was 2,000 hours; the actual life was 2,500 hours for 1948, 2,000
hours for 1949, 1,700 hours for 1950; 1,500 hours for 1951, 1,200
hours for 1952, and 1,000 hours, I believe, for 1953. The DE tubes
developed the same defect as the MT and MR tubes mentioned above.
In addition, the DE tubes developed an unsteady emission. (The
emission was singing.)
15 v.
3,000 V.
150 watts
55%
8%
10,500 crowns
for transmitters
Electronic tubes with external anode and air cooli
(14) ACM 15
This tube
of medium
operation
?
Planned Ou:;put
1951 1922
93 units 165 units
1953
224 units
This . was a triode modulator.
Heater voltage 18-19 v.
Heater current 20 ampheres
Anode voltage 6,000 v.
Anode dissipation 1.2 kilowatts
Anode Copper
Cathode Tungsten, directly
heated
Grid Molybdenum
Mass Lead glass
Rejects 25%
Returned 5%
Guarantee 2,000 hours
was used as a modulator for broadcast transmitters
and low power (up to 50 kw.) which were put in
in Czechoslovakia mainly after 1945.
ACM 3 Triode modulator of an older design (the radiator was
of an older design also).
The tube was used, probably, for one old broadcast
transmitter.
Heater voltage
Heater current
Anode voltage
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18-19 v.
20 ampheres
60000 v.
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.(16) ACR 2
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Anode dissipation
Anode
Cathode
Grid
Glass
Guarantee
Rejects
Returned
Price
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1.2 kilowatts
Copper
Wolfram
Molybdenum
Lead glass
Not stipulated. If it
were stipulated, it
might be 2,000 hours.
35%
Not known
I believe about
10,000 crowns
Mass production started in early 1953. It
was planned to produce 72 units during 1953.
believe that this goal could be met.
Diode rectifier (vacuum)
Heater voltage
Anode voltage
Anode dissipation
Anode
Cathode
Glass
Rejects
Returned
Price
Guarantee
15-20 v.
about 60000 v.
about 1,000 watts
Copper
Tungsten
Lead glass
25%
5%
7,500 crowns
Not stipulated. If it
were stipulated, I be-
lieve it would be
,000 hours.
This tube was most probably used for vpre- cast transmitter.
transmitter.
Plant output for 1951 unknown: 1952-12 units, 1953-10 units.
(17) ACS 2
This tube was used
'18) ACT 9
Tetrode. The production of this tube
started in 1953. The planned output for
1953 was 20 units.
Heater voltage
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Glass
15-20 v.
6,o0o v.
about 1,000 watts
Copper
TUngisten-thorium
Molybdenum
Lead glass
for pre-World War II transmitters.
Oscillator triode
Heater voltage
Heater current
Anode voltage
Anode dissipation
Anode
Cathode
Grid
16.5 v.
24 amp. eres
6,000 v.
1.2 kilowatts
Copper
Tungsten
Molybdenum
Planned output for 1951, 540 units; for
1952, 540 units; for 1953, 740 units. I
believe this output could be achieved.
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Price
Guarantee
8,000 crowns
2,500 hours
This tube was frequently used for both old and new middle-wave
transmitters in operation. About six per cent of the total
yearly output of this tube was sent to the Vrsovice Transmitter.
The Tesla Vrsovide plant used this tube for generators for high-
frequency heating in the plant itself.
(19) ACT 16
50X1
(20) ACT 201
Short-wave triode, bottom
limit-12 m., with radial cooling fence of
new Czechoslovak design. About two thirds
of the total output of this tube were used
as oscillator and one third as modulator.
Heater voltage
Heater current
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Rejects
Returned
Damaged in transit
Guarantee
20 v.
100 amp eres
15,000 v.
15,000 watts
Copper
Tungsten
Molybdenum
35%
15%
15%
Not stipulated. I
believe that the actual
life was 1,000 hours
in 1951, 1,500 in 1952,
and 1,600 in 1953.
The planned outptr 1951 was 74 units;
for 1952, 215 uni' , for 1953, 842 units.
I believe that 50 tilbtl Were produced in
1951, 180 in 1952, and 600 in 1953.
Price 50:00 20,300 crowns
Oscillator triode. This
tuoe was usually for middle-wave broadcast,
exceptionally for short-wave, bottom
limit-20 in.
It was planned to use this tube in a new type of transmitter
which was under construction An the Tesla Hloubetin plant in
1952. (I believe that it was planned to use this transmitter
as a jamming transmitter.) This transmitter had 100 kilowatts
and was for middle-wave. In spring 1952, representatives of
Tesla Hloubetin asked for urgent delivery of a few units of this
tube for summer 1952. The planned output for 1952 was 53 units,
but only about five units were manufactured during that year.
It was planned to produce 180 units in 1953; however, I believe
that only 150 units at the most could be produced.
Heater voltage
Heater current
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Price
Guarantee
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32v.
220 amp eres
20,000 V.
50 kw. (tested for
60 kw.)
Copper
Tungsten
Molybdenum
th?known
Not yet established.
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(21) ACT 14
Transmitter electronic
Designation
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bZWIZT
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50X1
Oscillator triode equipped with radial
cooling fence of new Czechoslovak design.
This tube was developed from the CAT 6
type gee belog.
The planned output for 1952 was 24 units,
but I believe that none were produced that
year. Planned output for 1953 was 46 units.
I believe that this number could be produced.
It was planned to use this tube for a new
type of transmitter, serial production of
which was in preparation.
Heater voltage
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Price not stipulated.
22,000 crowns
tubes with external anode and
for this type is "Cil
(22) CAT 3 .
(3),
This tube was not
in operation for'
CAT 6
Thi trbo was
-transmItters
waLL6
' Oscillator triode
Heater voltage
Anode voltage
Anode dl!isip;:11
Anode
Cathode
Grid
Price
Guarantee
20 v.
12,000 v.
about 8,000 watts
Copper
Tungsten
Molybdenum
Probable price is
water cooling:
frc-i:4 18-20 v.
12,000 V.
10,000 watts
Copper
Tungsten
Molybdenum
15,000 crowns
1,400 hours
The panned output for 1951 was 3 units;
for 1952, 30 units; for 1953, 15 units.
Rejects
Returned
frequently used and was
middle waves).
Oscillator triode
Heater voltage
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Price
,Guarantee
40%
4%
for an old transmitter
20 V.
12,000 V.
12,000 watts
Copper
Tungsten
Molybdenum
17,500 crowns
2,500 hours
Planned output for 1951 was 24 units;
1952, 74 units; for 1953, 96 units.
Rejects 35%
Returned 5%
2ed both for old and new types of broadcast
..1,ddle? waves of low power (under 20,000
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? -9-
(24) CAT 61E? Oscillator triode
? The tube had the same electric performance characteristics as
? CAT 6, but was designed for short wave (the grid outlet was of
a different design); bottom limit, 20 m. I believe it wa$
used for an old transmitter only. There was no planned output
for 1951 and 1952. Planned output for 1953 was 43 units.
I do not remember the price, but I believe it was 17,500
crowns.' Guarantee was not stipulated but I believe it might be
2,500 hours if there were one.
(25) CAT 9
Shortwave triode, bottom limit - 12 m., also suitable for.
middle waves. This tube was used for transmitters up to 50
kilowatts as oscillator (two thirds of the output) and as
modulator, mostly for recent broadcast transmitters in operation,
but also for old transetters. I know that it was used for the
Liblice Transmitter (Prague I transmitter) which was a middle-
wave transmitter, a Standard Electric product, and also most
? probably for the Warsaw Transmitter. In both cases it was for
auxiliary transmitter equipment. Further, this tube was used
in the Tesla Roznov plant in generators for high-frequency
heating to replace TA 12/20, a Philips product. The CAT 9
type was popular and often used. The tube was well designed and
the tube was easy to produce.
Heater. voltage
Heater current
Anode voltage
Anode dipet
Anode
Cathode
Grid
Rejects
Returned
Daw in
Price
Guarantee
20 v.
100 ampares'
15,000 v.
20,000 watts
Copper
Tungsten
Molybdenum
20%
transit 20.*
20,300 crowns
2,500 hours .
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Planned output for 1951, 130 units; for
1952, 132 units; however, 180 units were
produced during 1952 and the planned out-
put decreased for 1953 to 83 units. This
decrease in the planned Output for 1953
proves that this tube was still destined
only for transmitters in operation and not
for transmitters under construction.
(26) CAT 10 Oscillator triode
Heater voltage
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Glass
Price
Guarantee
30 V.
20,000 v.
about 50 kilowatts
Copper
Tungsten
Molybdenum
Lead glass
Unknownt I believe
about 25,000 crowns
2,500 hours
The planned output for 1952 was 5 units,
and for 1953 also 5 units (none was pro-
duced in 1951). This tube was used for
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an old transmitter only. The design of
this tube was old. The tube was equipped
with water-cooled cathode feeder.
(27) CAT 12A Triode
(28) CAT 14C
Heater voltage
Heater current
Anode voltage
Anode dissipation
Anode
Cathode
Grid
Rejects
Returned
Price
Guarantee
30 v.
220 amperes
20,000 V.
about 80 kw.
Copper
Tungsten
Molybdenum
20%
5%
32,200 crowns
2,500 hours
The planned output for 1951 was 5 units; for
1952, 11 units; and for 1953, 10 units.
The total output of this tube was exported
to Rumania for a transmitter, I believe
a long-wave one, built by the Marconi Firm.
I do not know the location or any other
details. (This tube was not used at all
in Czechoslovakia.)
Oscillator triode for middle and long waves.
Heater voltage
Heater current
Anode voltage
Anode dissipation
Emission
Anode
Cathode
Grid
Reje
ReturLed
Damaged in
Price
Guarantee
32 volts
450 amperes
25,000 V.
150 kilowatts
100 amperes
Copper
Tungsten
Molybdenum
25%
10%
transit 25%
71,150 crowns
3,000 hours
The tube had two water-cooled cathode feeders. This tube was
used mostly for transmitters built in Czechoslovakia after 1945.
It was used for the transmitter At Velke Kostolany 5 48-30,
E 17-417 and for a new transmitter named "Czechoslovakia" which
was installed in the first half of 1952 somewhere in the Gott-
waldov region. This transmitter had about 150 kilowatts power.
This tube was also used for the Warsaw Transmitter. The planned
output for 1951 was 80 units; for 1952, 42 units; and for 1953,
80 units. The increase of output in 1953 was destined for
transmitters under construction.
(29) CAT 17C
Short-wave oscillator, triode, bottom
limit-12 m. The electric performance
characteristics conformed to those of
the CAT 14C type, but the design was for
short-wave.
Rejects
Returned
Damaged in tran
Price
Guarantee
Cathode feeders
Grid outlet was
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28%
10%
sit 10%
116,600 crowns
2,500 hours
were air cooled.
ring-shaped.
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50X1
The planned output for 1951 was 21 units;
for 1952, 44 units; and for 1953, 73
units. I believe that the increase in
1.953 was for a short-wave high-power
transmitter under construction.
This tube was used for recent short-wave
broadcast transmitters of medium and
high power.
(30) CAT 20 Modulator triode
(31) CAT 201
Heater voltage 32 v.
Heater current 220 amperes
Anode voltage 20,000 V.
Anode dissipation From 80-100 kilowatts
Anode Copper
Cathode, Tungsten
Grid Molybdenum
Rejects 20%
Returned 50%
Price 32,200 crowns
Guarantee 3,000 hours
This tube was used for recent Czechoslovak
transmitters of medium and high power.
Oscillator triode, mainly for middle waves
but suitable also for short waves, bottom
limit about 20 m.
Heater viDltage 32 v.
Heater current 220 amperes
Anode Voltage 20,000 V.
Anode dissipation From 80-100 kilowatts
Rejects 25%
Returned 10%
DamaT ' in transit 20%
GUaraee 3,000 hours
Price 33,900 crowns
The planned output for 1951 was 17 units;
for 1952, 52 units; for 1953, 147 units.
The increase for 1953, I believe, was for
two new transmitters of medium power
which were probably under construction.
This tube was used for recent broadcast transmitters of medium
power (around 100 kilowatts).
(32) CAM 3 Modulator triode
Heater voltage 18-20 v.
Anode voltage 12,000 v.
Anode dissipation 12 kilowatts
Rejects 30%
Returned 4%
Price 16,300 crowns
Guarantee 2,500 hours
Planned output for 1951 was 31 units; for
1952, 0 units; tnd for 1953, 96 units.
Th.-ct- 44-- used both in old and in recent transmitters of
71w ower . 20 kilowatts) for middle Agaves in operation.
ThLt-.,,4bos was u, Is modulator in those transmitters where
CAT was used L Allator.
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-12-
33) CAR 2 Rectifier diode,
Heater voltage
Anode voltage
Maximum rectified
Anode
Cathode
Glass
Rejects
Returned
Guarantee
Price
This tube was used for old transmitters
power in operation.
vacuum
Up to 20 V.
12,000 V.
current 1 ampere
Copper
Tungsten
Lead glass
20%
3%
2,500 hours
15,600 crowns
of medium and low
50X1
The planned output for 1951 was 7 units;
for 1952, 0 units; and for 1953, 29 units.
(34) CAR 4 'Diode rectifier, vacuum
Same specifications as CAR 2 (slight
difference in dimensions only)
The planned output for 1951 was 7 units;
for 1952, 0 units; and for 1953, 10 units.
(35) CAR 6 Diode rectifier, vacuum
Heater voltage
Anode voltage
Maximum rectified
Rejects
Returned
Guarantee
Price
Up "Go 20 v.
25,000 v
7ent 2.5 amperes
5%
2,500 hors
23,600 crowns
The nned output for 1951 was 59 units;
for 134 units; and for 1953, 125
units.
This tube was used for medium and high-powered transmitters of
post-World War II Czechoslovak construction (mainly for the
Velke Kostolany and Czechoslovakia transmitters) and it was
to be used for transmitters under construction. This tube
was more frequently used than the CAR 14 andCAR 2 types. How-
ever, efforts were made to replace all these three vacuum
rectifiers by mercury rectifiers. Zffee below.17
8. Medium power special electronic tubes with heater cathode and natural
cooling:
36) GU 14
Diode, used in various types of high
voltage rectifiers both for transmitters
of low power and for industrial purposes.
Heater voltage
Anode voltage
Maximum rectified
Anode
Cathode
Glass
Rejects
Returned
Guarantee
Actual life
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2.5 v.
10,000 V.
current 1 ampere
Molybdenum
Nickel coated with
barium oxide
Molybdenum
20%
5%
1,200 hours
2,000 hours for 1948
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OZtin.c,-.L
-13 50X1
The actual life did not decrease after
1948 as rapidly as for most tubes, but
equaled the guarantee as-Of:1953.
( -7) GU 11
( 38)
50X1
Price 1,750 crowns
The planned output for 1951 was 1,000
units; for 1952, 2,700 units; and for
1953, 7,551 units. However, I believe
that only about 5,000 units could be pro-
duced during 1953. The increase for 1953
was occasioned, I believe, by a plan to
use these tubes in rectifiers for, new
transmitters (jamming transmitters) under
construction in the Tesla Hloubetin plant
Diode
Heater voltage
Anode voltage
Maximum rectified
Anode
Cathode
Glass
Rejects
Returned
Guarantee
2.5 V. or 5 v.
15,000 v.
current 2 amperes
Molybdenum
Nickel, coated with
barium oxide
Molybdenum
30%
20%
Not stipulated;
the actual life was
Boo hours from 1950
Through 1953.
This tube was deve in 1948. The
planned output for 1951 was 370 units; for
1952, 750 units; and for 19530 3,519 units.
However, I believe that only 2,500 units
coul 7, produced in 1953. The reason
for increase for 1953 is the same as
for the GU 14.
The tube was used for various types of high-voltage rectifiers
both for transmitters of low power and for industrial purposes.
The GU 11 with five volts heater voltage was used for the
Podebrady Transmitter only.
This tube was smaller in size than it should be for its power.
The surface of the envelope was not large enough and therefore
caused insufficient cooling which resulted in lower inversion
voltage.
GT 14
Thyratron (mercury
grid).
Heater voltage
Anode voltage
Rectified current
Rejects
Returned
Cathode
Anode
Glass
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rectifier with control
2.5 or 5 v.
10,000 v.
1 ampere
25%
5%
Nickel coated with
barium oxide
Molybdenum
Molybdenum
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-14-
50:00
There was no guarantee. The actual life
was about 2,000 hours for 1948 and decreasel
to some 1,200 hours in 1953.
Price
I do not remember
the exact price but
I believe it was
3,500 crowns.
The tube was used in two Czechoslovak transmitters, one of
which was probably the Jihlava Transmitter, and for various
purposes, such as for rectifiers for industrial purposes and
in other industrial equipment.
(39) GT 15 Thyratron
Heater voltage
Heater current
Anode voltage
Maximum rectified
current
Cathode
Anode
Glass
Rejects
Returned
5v.
About 20 aMperes
20,000 v.
(tested up to 25,000 v.)
6 amperes
Nickel, coated with
barium oxide
Molybdenum or carbon
Molybdenum
40%
25%
There was no guarantee; the actual life
was about 1,000 hours from 1950-1953.
Price 9,000 crowns
The planned output for 1951 was 140 units;
for 1952, 500 units; and for 1953, 1,169
units The total 1951 output was solely
for .tie Warsaw Transmitter- The 1952 out-
put was also for the Warsaw Transmitter
but the increase in the output in this
year was, I believe, for new transmitters
under construction, as mentioned above
under CAT 17C, CAT 201, and ACT 201. The
increase in the output for 1953 was, I
believe, for new transmitters (jamming
transmitters) under construction at that
time.
The GT 15 type showed the same defect as the GU 11. At the
beginning of 1951 there was equipment under development in the
then Tesla Vrsovice Transmitter Department which was intended
to keep the temperature of this tube at the desired level,
which was from 30 to 4000. A mild air current was blown into
a cover which was arranged around the tube. The temperature
of :the air current was kept at the desired level by an elec-
tric spiral. It was planned to send this equipment for use
with the Warsaw Transmitter and, if it proved satisfactory,
to use it with all the future GT 15 tubes. I do not know the
results of this development.
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-15-
Development
(40) The development of a new transmitter air-cooled tube started
in the Tesla Vrsovice plant in the second half of 1952. The
first unit was manufactured in early 1953. This was the first
Czechoslovak attempt to develop transmitter tubes of modern
types. The tube was designed according to the ATL 2-1 type,
a Brown Boveri, Switzerland, product. Some samples of this
tube were under study in the Tesla Vrsovice plant. The Czecho-
slovak tube was also called ATL-2, but no official designation
had been given the tube as of summer 1953. The tube was still
under development in 1953, and I believe that the tube might
have been set into mass production at the beginning of 1954.
The tube was an oscillator triode for low-power broadcast
transmitters.
Heater voltage
Heater current
Anode voltage
Anode dissipation
Cathode
Anode
Grid
Glass
Conduits
12 V.
50 amperes
5,000 v.
2 kilowatts
Tungsten, directly
heated
Copper
Molybdenum
Kovarglass of
CzechotIovak origin
Kovar mecui
50X1
Comment: The expression "transmitter tubes" includes oscilla.
;ors, modulators, and vacuum rectifiers; IlperAal tubes" mean 50X1
mercury tubes in this report.
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