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Voltage - Triode (single high frequency) ·Triode

6AM4

High-frequency triode for UHF/VHF amplification, mixing, or oscillator service in television, FM, communications, or specialized RF equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
98X
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 225 mA

Description

High-mu triode for grounded-grid mixer service across VHF/UHF television frequencies.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
98X
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
225 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

98X - 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8700 Ω
Transconductance
0.0098 S
Amplification factor
85
Max plate voltage
200 V
Max plate dissipation
2 W
Rectifier max heater-cathode voltage
80 V

Promoted from published ratings/characteristics; identical repeated sections compressed where applicable.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Frequency Range Minimum

    470 MHz

    GroundedGrid

  • Frequency Range Maximum

    890 MHz

    GroundedGrid

  • Transconductance

    9800 µS

  • Plate Resistance

    8700 ohm

  • Amplification Factor

    85

Other

  • Plate Voltage

    200 V

  • Plate Current

    10 mA

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    200 V

    Published handbook rating

  • Plate voltage

    200 V

    ClassA

  • Plate current

    10 mA

    ClassA

Characteristic

  • Plate resistance

    8700 ohm

    Published handbook characteristic

  • Transconductance

    9800 µS

    Published handbook characteristic

  • Amplification factor

    85

    Published handbook characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    225 mA

    Published heater rating

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Plate-to-cathode capacitance

    0.16 pF

    Section1

  • Cathode-to-grid/heater capacitance

    4.6 pF

    Section1

  • Plate-to-grid/heater capacitance

    2.8 pF

    Section1

  • Heater-to-cathode capacitance

    1.8 pF

    Section1

Other

  • Plate voltage

    200 V

    GroundedGridMixer

  • Cathode-bias resistor

    200 Ω

    GroundedGridMixer

  • Application

    Grounded-grid mixer over VHF/UHF television range

    Section1

Characteristic

  • Plate resistance

    8700 Ω

    Section1

  • Transconductance

    9800 µS

    Section1