DEVELOPMENT OF POINT-CONTACT TYPE GERMANIUM TRANSISTORS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP83-00418R000300220007-3
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: July 22, 2009
• Sequence Number: 7
• Publication Date: June 9, 1955
• Content Type: REPORT

Approved For Release 2009/07/22 : CIA-RDP83-00418R000300220007-3
CENTRAL INTELLIGMCE AGBb1CY
INFORMATION REPORT
SECRET
This material contains information affecting the
National Defense of the United States within the
meaning of the Espionage Laws, Title 18, U.S.C.
Secs. 793 and 794, the transmission or revel-
ation of which in any manner to an unauthorized
person is prohibited by law.
COUNTRY East Germany
SUBJECT Development of Point-Contact
Type Germanium Transistors
DATE OF INFO.
PLACE ACQUIR
DATE ACQUIRE
REPORT
DATE DISTR.
NO. OF PAGES
REQUIREMENT
REFERENCES
9 June 1955
3
THE SOURCE EVALUATIONS IN THIS REPORT ARE,DEFINITIVE.
THE APPRAISAL OF CONTENT IS TENTATIVE.
(FOR KEY SEE REVERSE)
Large-scale production of point-contact germanium transistors at VEB
Werk fuer Bauelemente der achrichtentechnik, Teltow (form,erly Dralowid),
has not yet started. However, the enterprise has been engaged in the
production of zero-series of several types of transistors. These
types ares
as 1NC?4lO through 1NC-012s Amplifier transistors with a maximum
amplification factor of 17 decibelso
b. 1NCm020 through 1NC-022: inplifying transistors with a maximum
amplification factor of 20 decibels.
Co
2NC-010s
Circuit transistor.
d.
3NC-010s
Oscillator transistor.
2. Production of the zero-series of the transistor types m tibned re-
presents the successful conclusion of the transistor development.
Production is supposed to start.in the near'future,,
3. In April 1955, the enterprise c anized a meeting of a l?age number
of scientists and technicians a the use of transistors was ex-
plained to them in 'a lecture gi*In by Dr. Matthias Falter, head of
the Dralowid Research and Devel 41tent Department. On this occasion,
a radio receiver and loud-speaker circuit operated with transistors
instead of tubes was successfully ' emonstrated.
4. Ten transistors of the 1NC--010 type were completed in late iipril 1955.
The following are the data on the tenth of these transistors desig-
nated by 44/010. The data were obtained in a test carried out by
25 YEAR
RE-REVIEW
STATE I X I ARMY -X ~1~NAVY AIR X FBI
(Note: Washington distribution indicated by "X"; Field distribution by "#")
25X1
Approved For Release 2009/07/22 : CIA-RDP83-00418R000300220007-3
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50
Input resistance with open collector
Basis resistance
Output resistance with open emitter
Transi resistance
Current amplification
Voltage amplification
Short circuit stability
Performance amplification
Limit frequency
Collector voltage
Collector current
Emitter voltage
Emitter current
Favorable input resistance
Favorable output resistance
Maximum collector voltage
Maximum collector dissipation
Maximum emitter dissipation
Maximum input alternating voltage
Maximum ambient temperature
230 Ohms
85 Ohms
14 kilo-ohms
17 kilo-ohms
1.21
74
0.45
14.7 decibels
0.55 MHz
30 o1ts
3. milliamperes
0.26 volt'
1 milliamperes
200 Ohms
10 kilo-ohms
42 volts
100 millivolts
10 millivolts
0$15 volt
40 Centigrade
As of early May 19558 the work of the Dralowid research and devo'lopm
ment team on the development of junction-type transistors had not
progressed beyond the stage reached in November 1954, i.,e0 beyond th
development of junction-type rectifiers from n=germanium and indiui1,
Development of these rectifiers is considered to be an initial step
in the development of junction-type transistors. Even the junction-
type rectifiers so far developed are not functioning well and pro-
duction of this type of rectifier has not yet started.
Approved For Release 2009/07/22 : CIA-RDP83-00418R000300220007-3
 Approved For Release 2009/07/22 : CIA-RDP83-00418R000300220007-3
Approved For Release 2009/07/22 : CIA-RDP83-00418R000300220007-3