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

Voltage - Triode (single) ·Triode

6AD4

General-purpose triode for receiving, amplification, driver, or electronic service as documented by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8DK
Socket code
-
Base pins
-
Nominal heater
6.3 V / 150 mA

Description

Sylvania 6AD4 is a subminiature high-mu triode with flexible leads, 6.3-volt heater, and published 100-volt operating characteristics.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8DK
Socket code
-
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
150 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8DK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

EIA source transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8DK

PIN3H—H — Heater

EIA source transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8DK

PIN5KAK — Cathode

EIA source transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8DK

PIN6H—H — Heater

EIA source transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8DK

PIN8PAP — Plate (Anode)

EIA source transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8DK

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
35000 Ω
Transconductance
0.002 S
Amplification factor
70
Max plate voltage
150 V
Max plate dissipation
0.3 W
Max cathode current
2 mA

High-mu triode 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate Resistance

    35000 ohm

  • Transconductance

    2000 µS

  • Amplification Factor

    70

Other

  • Maximum Plate Voltage

    150 V

  • Maximum Plate Dissipation

    0.3 W

  • Maximum Cathode Current

    2 mA

  • Typical Plate Voltage

    100 V

  • Typical Plate Current

    1.4 mA

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Input capacitance

    1.9 pF

    Published table value

  • Output capacitance

    2.2 pF

    Published table value

  • Grid-to-plate capacitance

    0.7 pF

    Published table value

Other

  • Plate voltage

    100 V

    ClassA

  • Cathode resistor

    820 ohm

    ClassA

  • Plate current

    1.4 mA

    ClassA