3E6

Directly heated sharp-cutoff RF pentode with flexible series/parallel filament operation for battery equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CJ
Socket code: B7G
Base pins: 8
Nominal heater: 2.8 V / 50 mA

Description

Sharp-cutoff RF pentode with series/parallel filament operation for battery equipment.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CJ
Socket code: B7G
Base pins: 8
Nominal heater voltage: 2.8 V
Nominal heater current: 50 mA
Parallel heater voltage: 1.4 V
Parallel heater current: 100 mA
Series capable: Yes

7CJ - 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: 325000 Ω
Transconductance: 0.0017 S
Max plate voltage: 110 V
Max screen voltage: 110 V
Max cathode current: 12 mA

Tung-Sol 3E6 directly heated 8-pin lock-in high-gm sharp-cutoff RF pentode with two-section series/parallel filament. SERIES: filament 2.8 V 50 mA, typical plate/screen 90 V, plate current 2.9 mA, screen current 1.2 mA, gm 1700 µmhos (0.0017 S), approximate plate resistance 325 kΩ. PARALLEL: filament 1.4 V 100 mA, same typical 90 V plate/screen, gm 2000 µmhos (0.002 S), rp 250 kΩ. Manufacturer maximum plate and screen 110 V. Maximum cathode current 12 mA in series operation, or 6 mA per 1.4 V filament section in parallel mode. Manufacturer specifies external shunting resistor across filament sections for series service. Existing B7G socket code is inconsistent with manufacturer's eight-pin lock-in base; held pending canonical base-code reconciliation.

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

Other

Plate voltage
90 V
ClassA;SeriesFilaments
Screen-grid voltage
90 V
ClassA;SeriesFilaments
Grid No.1 bias
R=2meg V
ClassA;SeriesFilaments
Plate current
2.9 mA
ClassA;SeriesFilaments
Screen-grid current
1.2 mA
ClassA;SeriesFilaments
Plate resistance
325000 ohm
ClassA;SeriesFilaments
Transconductance
1700 uS
ClassA;SeriesFilaments
Plate voltage
90 V
ClassA;ParallelFilaments
Screen-grid voltage
90 V
ClassA;ParallelFilaments
Grid No.1 bias
R=2meg V
ClassA;ParallelFilaments
Plate current
4.2 mA
ClassA;ParallelFilaments
Screen-grid current
1.7 mA
ClassA;ParallelFilaments
Plate resistance
250000 ohm
ClassA;ParallelFilaments
Transconductance
2000 uS
ClassA;ParallelFilaments

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

MAX IMUM PLATE VOLTAGE 110
110 VOLTS
Published datasheet value
MAX IMUM CATHODE CURRENT 6°
12 VOLTS
Published datasheet value
PLATE VOLTAGE 90
90 VOLTS
Published datasheet value
PLATE CURRENT 4.2
2.9 MA
Published datasheet value
GRID #2 CURRENT 1.7
1.2 MA
Published datasheet value