6948

Subminiature high-mu twin triode designed specifically for guided-missile service, providing two general-purpose voltage-amplifier sections in rugged compact construction for military electronics.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 8
Nominal heater: 6.3 V / 350 mA

Description

THE 6948 IS A GENERAL PURPOSE HIGH-MU TWIN TRIODE IN THE 8 PIN SUBMINIATURE CON- STRUCTION. IT IS DESIGNED SPECIFICALLY FOR GUIDED MISSILE SERVICE. THIS TYPE IS CHARAC-

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
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: 0.00165 S
Amplification factor: 70
Max plate voltage: 250 V
Max plate dissipation: 0.5 W
Max cathode current: 10 mA
Rectifier max heater-cathode voltage: 200 V

Published promoted fields populated from the datasheet; identical repeated sections compressed where applicable.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00165 S
Amplification factor: 70
Max plate voltage: 250 V
Max plate dissipation: 0.5 W
Max cathode current: 10 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
1650 µS
Amplification Factor
70

Other

Maximum Plate Voltage
250 V
Maximum Plate Dissipation
0.5 W

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

PeakPlateForwardVoltage
360 V
EachSection
Altitude
80000 ft
SpecialTest

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
0.5 W
Promoted published value
PEAK —PLATE FORWARD VOLTAGE
360 V
MAXIMUM RATINGS —EACH
PLATE DISSIPATION
0.5 W
MAXIMUM RATINGS —EACH
DC PLATE CURRENT
10 mA
MAXIMUM RATINGS —EACH
GRID CIRCUIT RESISTANCE
1 ohm
MAXIMUM RATINGS —EACH
DC GRID VOLTAGE FOR I b=
3.5 mA
CHARACTERISTICS —EACH SECTION
ALTITUDE— ABSOLUTE MAXIMUM
80000 mA
SPECIAL TESTS AND RATINGS

Characteristic

Transconductance
1650 uS
Promoted published value
Amplification factor
70
Promoted published value
LIMITS OF APPLIED VOLTAGE 5.5 TO
6.9 V
AVERAGE CHARACTERISTICS 6.3 VOLTS 350 mA
DC PLATE VOLTAGE
100 V
CHARACTERISTICS —EACH SECTION
DC PLATE CURRENT
0.8 mA
CHARACTERISTICS —EACH SECTION
AMPLIFICATION FACTOR 70
70 A
CHARACTERISTICS —EACH SECTION