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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

26C6

Double-diode low-mu triode combining detector functions with a comparatively strong current-driving amplifier. Paired diodes provide signal and control rectification while the triode offers low plate resistance.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
3
Base
7BT
Socket code
B7G
Base pins
7
Nominal heater
26.5 V / 70 mA

Description

Twin-diode medium-mu triode for aircraft-receiver detector, AVC, and amplifier service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7BT
Socket code
B7G
Base pins
7
Nominal heater voltage
26.5 V
Nominal heater current
70 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7BT - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN11G1AG1 — Control Grid

EIA source label 1G1; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

PIN2KAK — Cathode

EIA source label K; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

PIN3H—H — Heater

EIA source label H; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

PIN4H—H — Heater

EIA source label H; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

PIN52PBP — Plate (Anode)

EIA source label 2P; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

PIN63PCP — Plate (Anode)

EIA source label 3P; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

PIN71PAP — Plate (Anode)

EIA source label 1P; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BT

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances
Max plate voltage
250 V

Published promoted values applied where semantically applicable; additional table values retained in section parameters.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published maximum ratings, representative operating conditions, rectifier service data, and capacitance columns reviewed.

Section 3

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8500 Ω
Transconductance
0.0019 S
Amplification factor
16
Max plate voltage
250 V

Published maximum ratings, representative operating conditions, rectifier service data, and capacitance columns reviewed.

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 3

Triode

Other

  • Maximum plate voltage

    250 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Control-grid bias

    9 V

    ClassA

  • Plate current

    9.5 mA

    ClassA

  • Low-voltage plate supply

    26.5 V

    LowVoltageOperation

  • Low-voltage plate current

    1.1 mA

    LowVoltageOperation

  • Grid resistor

    2000000 ohm

    LowVoltageOperation

Characteristic

  • Plate resistance

    8500 ohm

    Published handbook characteristic

  • Transconductance

    1900 µS

    Published handbook characteristic

  • Amplification factor

    16

    Published handbook characteristic

  • Heater/filament voltage

    26.5 V

    Published heater/filament rating

  • Heater/filament current

    70 mA

    Published heater/filament rating

  • Low-voltage plate resistance

    15500 ohm

    LowVoltageOperation

  • Low-voltage transconductance

    1100 µS

    LowVoltageOperation

  • Low-voltage amplification factor

    17

    LowVoltageOperation

Capacitance

  • Input capacitance

    1.8 pF

    Published capacitance column

  • Output capacitance

    1.4 pF

    Published capacitance column

  • Grid-to-plate capacitance

    2 pF

    Published capacitance column

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Diode

Application

  • Application

    Detector / AVC

SECTION 3

Triode

Application

  • Application

    Audio / signal amplifier

Data set 03

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

  • Voltage

    26.5 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Current — published value 1

    0

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Current — published value 2

    7

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Triode Unit: Grid to Plate

    2

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid to Cathode & Heater

    1.8

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate to Cathode d Heater

    1.4

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 1 -Triode Grid — published value 1

    1

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 1 -Triode Grid — published value 2

    5

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 2 -Cathode — published value 1

    2

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 2 -Cathode — published value 2

    6

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • ~ Pin 7 -Triode Plate

    7

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Voltage — published value 1

    26.5 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Voltage — published value 2

    250 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • From a grid resistor of

    2 Mohm

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Resistance — published value 1

    15500 ohm

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Resistance — published value 2

    8500 ohm

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Transconductance — published value 1

    1100

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Transconductance — published value 2

    1900

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Current — published value 1

    1.1 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Current — published value 2

    9.5 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • See RESISTANCE-COUPLED AMPLIFIER CHART, Type 6R7

    6

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

Other

  • PLATE VOLTAGE

    250 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE DISSIPATION

    2.5 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Heater negative with respect to cathode

    90 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Heater positive with respect to cathode

    90 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.