6947

Premium subminiature medium-mu twin triode designed specifically for guided-missile service, combining general-purpose amplifier characteristics with construction suited to demanding military electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: 8
Nominal heater: 6.3 V / 350 mA

Description

THE 6947 IS A SUBMINIATURE GENERAL PURPOSE MEDIUM-MU TWIN TRIODE IN THE 8 PIN SUB- MINIATURE CONSTRUCTION. IT IS DESIGNED SPECIFICALLY FOR GUIDED MISSILE SERVICE. THIS

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 350 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.004 S
Amplification factor: 35
Max plate voltage: 250 V
Max plate dissipation: 0.75 W
Max cathode current: 13 mA

Published source ratings/characteristics promoted where applicable; identical repeated sections compressed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.004 S
Amplification factor: 35
Max plate voltage: 250 V
Max plate dissipation: 0.75 W
Max cathode current: 13 mA

Second physical triode section; electrically identical twin section.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Transconductance
4000 µS
Amplification Factor
35

Other

Maximum Plate Voltage
250 V
Maximum Plate Dissipation
0.75 W
Maximum Cathode Current
13 mA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Nominal
Heater current
350 mA
Nominal
Plate voltage
250 V
Published operating table; OperatingPoint1
Plate voltage
150 V
Published operating table; OperatingPoint1
Maximum altitude
80000 ft
Maximum neutron total dosage
10000000000000000 n/cm2
Radiation
Maximum neutron dose rate
1000000000000 n/cm2/s
Radiation

Characteristic

Plate current
13 mA
Published operating table; OperatingPoint1
Plate current
6.5 mA
Published operating table; OperatingPoint1

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Nominal
Heater current
350 mA
Nominal
Maximum plate voltage
250 V
Promoted published value
Maximum plate dissipation
0.75 W
Promoted published value
DC PLATE VOLTAGE
250 V
MAXIMUM RATINGS -EACH SECTION
PEAK -PLATE FORWARD VOLTAGE
360 V
MAXIMUM RATINGS -EACH SECTION
PLATE DISSIPATION
0.75 W
MAXIMUM RATINGS -EACH SECTION
PLATE CURRENT
13 mA
MAXIMUM RATINGS -EACH SECTION
GRID CIRCUIT RESISTANCE
1 ohm
MAXIMUM RATINGS -EACH SECTION
BULB TEMPERATURE
250 C
MAXIMUM RATINGS -EACH SECTION
GRID VOLTAGE FOR i y =
-9 V
CHARACTERISTICS -EACH SECTION
ALTITUDE -ABSOLUTE MAXIMUM
80000 mA
SPECIAL TESTS AND RATINGS

Characteristic

Transconductance
4000 uS
Promoted published value
Amplification factor
35
Promoted published value
'JMITSOF APPLIED VOLTAGE 5.5T
6.9 V
AVERAGE CHARACTERISTICS 6.3 VOLTS 350 mA
DC PLATE VOLTAGE
150 V
CHARACTERISTICS -EACH SECTION
PLATE CURRENT
6.5 mA
CHARACTERISTICS -EACH SECTION
AMPLIFICATION FACTOR 35
35 A
CHARACTERISTICS -EACH SECTION