Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Triode Pentode ·Pentode-Triode

4HG8

No short description is recorded for this tube.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
-
Base pins
-
Nominal heater
4.5 V / 600 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
4.5 V
Nominal heater current
600 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
Plate resistance
3100 Ω
Transconductance
0.0055 S
Amplification factor
17
Max plate voltage
125 V
Max plate dissipation
1.9 W

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
350000 Ω
Transconductance
0.012 S
Amplification factor
70
Max plate voltage
250 V
Max plate dissipation
2.2 W
Max screen dissipation
0.55 W

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

1970 Sylvania Technical Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    100 V

  • Grid Voltage

    -3 V

  • Plate Current

    14 mA

SECTION 2

Pentode

Other

  • Plate Voltage

    170 V

  • Screen Voltage

    150 V

  • Grid Voltage

    -1.2 V

  • Plate Current

    10 mA

  • Screen Current

    3.3 mA