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Voltage Pentode - Remote Cutoff (single) ·Pentode

26A6

Seven-pin miniature remote-cutoff pentode designed for aircraft receivers powered from storage batteries. Its 26.5 V, 70 mA heater and high transconductance support variable-gain RF/IF amplification in airborne radio equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7BK
Socket code
B7G
Base pins
7
Nominal heater
26.5 V / 70 mA

Description

The 26A6 is a 7-pin miniature remote-cutoff pentode with a 26.5 V, 70 mA heater. It was grouped with tubes intended for aircraft receivers powered from 12-cell storage batteries and emphasizes high transconductance.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7BK
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

7BK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN2G3AG3 — Suppressor GridGroup 7BK2

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN2ISAIS — Internal ScreenGroup 7BK2

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN3H—H — Heater

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN4H—H — Heater

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN5PAP — Plate (Anode)

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN6G2AG2 — Screen Grid

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

PIN7KAK — Cathode

EIA chart transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 128, 7BK

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
1000000 Ω
Transconductance
0.004 S
Max plate voltage
250 V
Max screen voltage
100 V
Max plate dissipation
3 W
Max screen dissipation
0.4 W

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

Pentode

Other

  • Maximum plate voltage

    250 V

    Published handbook rating

  • Maximum screen voltage

    100 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Control-grid bias

    10.5 V

    ClassA

  • Plate current

    4 mA

    ClassA

Characteristic

  • Plate resistance

    1000000 ohm

    Published handbook characteristic

  • Transconductance

    4000 µS

    Published handbook characteristic

  • Heater/filament voltage

    26.5 V

    Published heater/filament rating

  • Heater/filament current

    70 mA

    Published heater/filament rating

Capacitance

  • Input capacitance

    6 pF

    Published capacitance column

  • Output capacitance

    5 pF

    Published capacitance column

  • Grid-to-plate capacitance

    0.0035 pF

    Published capacitance column

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Screen supply

    100 V

  • Screen current

    4 mA

  • Plate current

    10.5 mA

  • Alternate screen voltage

    26.5 V

  • Alternate plate current

    1.7 mA

  • Grid circuit resistance

    2 Mohm

Data set 03

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Current

    0.07

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

  • Pin 1 -Grid No.1 — published value 1

    1

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

  • Pin 1 -Grid No.1 — published value 2

    4

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

  • Pin 2 -Grid No. 3, — published value 1

    2

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

  • Pin 2 -Grid No. 3, — published value 2

    3

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

  • Pin 2 -Grid No. 3, — published value 3

    5

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

  • internal Shield ~`

    6

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

  • Pin 3 -Heater — published value 1

    3

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

  • Pin 3 -Heater — published value 2

    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.

  • Grid-No.2 Voltage — published value 1

    26.5 V

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

  • Grid-No.2 Voltage — published value 2

    100 V

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

  • From a grid-No.l resistor of

    2 Mohm

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

  • Plate Resistance (Approx ) — published value 1

    0.25 Mohm

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

  • Plate Resistance (Approx ) — published value 2

    1 Mohm

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

  • Transconductance — published value 1

    2000

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

  • Transconductance — published value 2

    4000

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

  • transconductance of 40 µmhos — published value 1

    40 V

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

  • transconductance of 40 µmhos — published value 2

    25 V

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

  • transconductance of 20 µmhos — published value 1

    20 V

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

  • transconductance of 20 µmhos — published value 2

    8 V

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

  • Plate Current — published value 1

    1.7 mA

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

  • Plate Current — published value 2

    10.5 mA

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

  • Grid—No.2 Current — published value 1

    0.7 mA

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

  • Grid—No.2 Current — published value 2

    4 mA

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

  • PLATE ~Ib~OR GRID-N~2~IC2~MILLIAMPERES

    2 mA

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

  • HEATER VOLTS=PLATE VOLTS=GRID-N4 2 VOLTS=26.5 — published value 1

    2 V

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

  • HEATER VOLTS=PLATE VOLTS=GRID-N4 2 VOLTS=26.5 — published value 2

    26.5 V

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

  • PL ATE(Ib) OR GRID -N°2 (I~z) MILLIAMPERES

    2 mA

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

  • ~: GRID-NI'2 VOLTS=100 — published value 1

    2 V

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

  • ~: GRID-NI'2 VOLTS=100 — published value 2

    100 V

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

Other

  • Grid No.l to Plate

    0.0035 mA

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

  • PLATE VOLTAGE

    250 V

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

  • GRID-No.2 (SCREEN) VOLTAGE

    100 V

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

  • GRID-No.2 SUPPLY VOLTAGE

    250 V

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

  • PLATE DISSIPATION

    3 mA

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

  • Negative bias value

    50 V

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

  • Positive bias value

    0 V

    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.