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Voltage - Triode (single high frequency) ·Triode

6L4

UHF oscillator triode similar to 6F4, with higher plate voltage capability and lower grid-to-plate capacitance.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7BR
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 225 mA

Description

UHF oscillator triode similar to 6F4 with higher plate voltage and lower grid-to-plate capacitance.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7BR
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
225 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7BR - 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
4400 Ω
Transconductance
0.0064 S
Amplification factor
28
Max plate voltage
500 V

Promoted from printed maximum-rating/characteristic columns; additional published operating points and capacitances retained as parameters.

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

Triode

Capacitance

  • Input capacitance

    0.5 pF

    Section1

  • Output capacitance

    1.8 pF

    Section1

  • Grid-to-plate capacitance

    1.6 pF

    Section1

Other

  • Plate voltage

    80 V

    ClassA

  • Cathode resistor

    150 Ω

    ClassA

  • Plate current

    9.5 mA

    ClassA

Characteristic

  • Plate resistance

    4400 Ω

    ClassA

  • Transconductance

    6400 µS

    ClassA

  • Amplification factor

    28

    ClassA

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

  • Application

    UHF oscillator / amplifier