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Tube Tinker — Electron Tube Database
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Voltage - Dual Triode (similar high frequency) ·Triode-Triode

6CH7

Medium-mu twin triode designed primarily as a cascode RF amplifier in VHF television tuners, providing high-frequency gain for receiver front ends.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9FC
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 400 mA

Description

Medium-mu twin triode designed primarily as a cascode RF amplifier in VHF television tuners.

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
9FC
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
400 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9FC - 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
5300 Ω
Transconductance
0.0068 S
Amplification factor
36
Max plate voltage
250 V
Max plate dissipation
2.6 W
Max cathode current
20 mA

Representative row for two essentially equivalent triode sections; section-specific capacitances preserved in parameters.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
5300 Ω
Transconductance
0.0068 S
Amplification factor
36
Max plate voltage
250 V
Max plate dissipation
2.6 W
Max cathode current
20 mA

Second physical triode 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    400 mA

  • Plate voltage

    150 V

    Typical operating conditions

  • Plate current

    10 mA

    Typical operating conditions

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid-to-plate capacitance

    1.1 pF

    Section1

  • Input capacitance

    2.4 pF

    Section1

  • Output capacitance

    0.8 pF

    Section1

  • Heater-to-cathode capacitance

    2.8 pF

    Section1

  • Heater-to-cathode capacitance

    2.8 pF

    Section2

  • Grid-to-grid capacitance

    0.15 pF

    BetweenSections

  • Plate-to-plate capacitance

    0.015 pF

    BetweenSections

Other

  • Plate voltage

    150 V

    ClassA;EachSection

  • Cathode bias resistor

    220 ohm

    ClassA;EachSection

  • Plate current

    10 mA

    ClassA;EachSection