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6391

Subminiature low-microphony voltage-amplifier pentode. Designed for sensitive signal stages where vibration-induced noise must be minimized, it combines compact construction with reduced microphonic response for dependable voltage amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 6391
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

Subminiature low-microphony voltage-amplifier pentode.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 6391
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

6391 - 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: 180000 Ω
Transconductance: 0.003 S
Max plate voltage: 175 V
Max screen voltage: 175 V
Max plate dissipation: 1 W
Max screen dissipation: 0.4 W
Max cathode current: 10 mA

Promoted from clearly identified printed ratings/characteristics; additional published operating points and capacitances retained in TUBE_SECTION_PARAMETER.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Input capacitance
4 pF
Section1
Output capacitance
5 pF
Section1
Grid-to-plate capacitance
0.15 pF
Section1

Other

Plate voltage
100 V
ClassA
Screen voltage
100 V
ClassA
Control-grid voltage
-1.4 V
ClassA
Plate current
7 mA
ClassA
Screen current
2.2 mA
ClassA

Characteristic

Plate resistance
180000 Ω
ClassA
Transconductance
3000 µS
ClassA

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
200 mA
Plate Voltage
100 V
Screen Voltage
100 V
Grid Voltage
-1.4 V
Plate Current
7 mA
Screen Current
2.2 mA
Transconductance
3000 uS