5916

Dual-control sharp-cutoff pentode for gated-amplifier and mixer service to approximately 400 MHz. Separate control grids provide switching and frequency-conversion functions, while its heater rating suits specialized aircraft and military electrical systems.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8DC
Socket code: B8D
Base pins: 8
Nominal heater: 26.5 V / 45 mA

Description

Sharp-cutoff dual-control pentode intended for gated-amplifier or mixer service at frequencies up to 400 megacycles.

Socket description

Subminiature 8-lead

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8DC
Socket code: B8D
Base pins: 8
Nominal heater voltage: 26.5 V
Nominal heater current: 45 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8DC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN2K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN3H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN4G3	A	G3 — Suppressor Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN5P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN6H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN7G2	A	G2 — Screen Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC
PIN8K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DC

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 110000 Ω
Transconductance: 0.0032 S
Max plate voltage: 165 V
Max screen voltage: 155 V
Max plate dissipation: 1.1 W

Dual-control pentode; promoted values use the grid-3-tied-to-cathode condition; second condition retained as parameters.

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

Grid No. 1 transconductance
3200 uS
Published datasheet value
Grid No. 3 transconductance
500 uS
Published datasheet value

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Voltage
100 V
ClassA;Grid3TiedToCathode
Screen Voltage
100 V
ClassA;Grid3TiedToCathode
Cathode Resistor
150 ohm
ClassA;Grid3TiedToCathode
Plate Current
5.6 mA
ClassA;Grid3TiedToCathode
Screen Current
4 mA
ClassA;Grid3TiedToCathode
Plate Resistance
110000 ohm
ClassA;Grid3TiedToCathode
Transconductance
3200 uS
ClassA;Grid3TiedToCathode
Plate Voltage
100 V
ClassA;Grid3Minus1V
Screen Voltage
100 V
ClassA;Grid3Minus1V
Grid3 Voltage
-1 V
ClassA;Grid3Minus1V
Cathode Resistor
150 ohm
ClassA;Grid3Minus1V
Plate Current
4 mA
ClassA;Grid3Minus1V
Screen Current
5.8 mA
ClassA;Grid3Minus1V
Plate Resistance
50000 ohm
ClassA;Grid3Minus1V
Transconductance
1950 uS
ClassA;Grid3Minus1V