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Voltage Dual Pentode ·Pentode-Pentode

1E7GT

GT-envelope directly heated twin power pentode designed for push-pull audio-output service in battery receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8C
Socket code: IO
Base pins: 8
Nominal heater: 2 V / 240 mA

Description

Directly heated twin-pentode power-amplifier tube; electrically identical pentode sections are compressed to one section row.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8C
Socket code: IO
Base pins: 8
Nominal heater voltage: 2 V
Nominal heater current: 240 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8C - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 260000 Ω
Transconductance: 0.001425 S
Max plate voltage: 135 V
Max screen voltage: 135 V

Each pentode section; identical-section compression applied.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 260000 Ω
Transconductance: 0.001425 S
Max plate voltage: 135 V
Max screen voltage: 135 V

Second physical pentode 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
135 V
EachSection
Maximum screen-grid voltage
135 V
EachSection
Plate voltage
135 V
ClassA EachSection
Screen-grid voltage
135 V
ClassA EachSection
Control-grid voltage
-4.5 V
ClassA EachSection
Plate current
7.5 mA
ClassA EachSection
Screen-grid current
2.2 mA
ClassA EachSection
Plate resistance
260000 Ohm
ClassA EachSection
Transconductance
1425 uS
ClassA EachSection
Load resistance
16000 Ohm
ClassA EachSection
Power output
0.29 W
ClassA EachSection
Plate voltage
90 V
ClassA EachSection 90V
Screen-grid voltage
90 V
ClassA EachSection 90V
Control-grid voltage
-3 V
ClassA EachSection 90V
Plate current
3.8 mA
ClassA EachSection 90V
Screen-grid current
1.1 mA
ClassA EachSection 90V
Plate resistance
340000 Ohm
ClassA EachSection 90V
Transconductance
1150 uS
ClassA EachSection 90V
Load resistance
20000 Ohm
ClassA EachSection 90V
Power output
0.11 W
ClassA EachSection 90V
Plate voltage
135 V
ClassA PushPull TwoSections
Screen-grid voltage
135 V
ClassA PushPull TwoSections
Control-grid voltage
-7.5 V
ClassA PushPull TwoSections
Plate current
7 mA
ClassA PushPull TwoSections
Screen-grid current
2 mA
ClassA PushPull TwoSections
Load resistance
24000 Ohm
ClassA PushPull TwoSections
Power output
0.575 W
ClassA PushPull TwoSections