6944

Reliable semi-remote-cutoff pentode designed for controlled-gain RF or AGC amplifier service in severe airborne or guided-missile environments.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8D
Base pins: 8
Nominal heater: 6.3 V / 175 mA

Description

Semi-remote-cutoff subminiature RF pentode designed specifically for guided-missile service under severe environmental conditions. Electrical ratings, characteristics, operating data, and special environmental information were extracted from the supplied source.

Socket description

Subminiature 8-lead

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8D
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 175 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 280000 Ω
Transconductance: 0.0032 S
Max plate voltage: 250 V
Max screen voltage: 150 V
Max plate dissipation: 1 W
Max screen dissipation: 0.36 W
Max cathode current: 15 mA

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

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

Pentode

Characteristic

Plate Resistance
280000 ohm
Transconductance
3200 µS

Other

Maximum Plate Voltage
250 V
Maximum Screen Voltage
150 V
Maximum Plate Dissipation
1 W
Maximum Screen Dissipation
0.36 W
Maximum Cathode Current
15 mA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Nominal
Heater current
175 mA
Nominal
Plate voltage
250 V
Published operating table; OperatingPoint1
Plate voltage
100 V
Published operating table; OperatingPoint1
Screen voltage
150 V
Published operating table; OperatingPoint1
Screen voltage
100 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
7 mA
Published operating table; OperatingPoint1
Transconductance
3200 uS
Published operating table; OperatingPoint1
Plate resistance
280000 ohm
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

Pentode

Characteristics

LIMITS OF APPLIED VOLTAGE — published value 1
5.5 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
LIMITS OF APPLIED VOLTAGE — published value 2
6.9 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC PLATE VOLTAGE
250 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PEAK-PLATE FORWARD VOLTAGE
360 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC GRID 2 VOLTAGE
150 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE DISSIPATION
1 W
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
GRID 2 DISSIPATION
0.36 W
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
GRID 1 CIRCUIT RESISTANCE
1 Mohm
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
BULB TEMPERATURE
250 C
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC PLATE VOLTAGE
100 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC GRID 3 VOLTAGE
0 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC GRID 2 VOLTAGE
100 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC PLATE CURRENT
7 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC GRID 2 CURRENT
2 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE
3200
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE RESISTANCE
280000 ohm
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
DC GRID 1 VOLTAGE FOR Gm = 25 {rMHOS APPROX. (75µMHOS MAX,)
-12 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
Plate resistance
280000 ohm
Promoted section value from the supplied datasheet.
Transconductance
0.0032 A/V
Promoted section value from the supplied datasheet.

Other

ALTITUDE -ABSOLUTE MAXNAUM
50000
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
Maximum plate voltage
250 V
Promoted section value from the supplied datasheet.
Maximum screen voltage
150 V
Promoted section value from the supplied datasheet.
Maximum plate dissipation
1 W
Promoted section value from the supplied datasheet.
Maximum screen dissipation
0.36 W
Promoted section value from the supplied datasheet.