26D6

Heptode oscillator-converter for superheterodyne receivers using low-current series heater strings. Its multi-grid structure combines local oscillation and mixing with high plate resistance and useful conversion gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CHV
Socket code: B7G
Base pins: 7
Nominal heater: 26 V / 70 mA

Description

Pentagrid converter for mixer and oscillator service in superheterodyne aircraft receivers.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CHV
Socket code: B7G
Base pins: 7
Nominal heater voltage: 26 V
Nominal heater current: 70 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CHV - 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

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.000475 S
Max plate voltage: 300 V
Max screen voltage: 100 V

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

Heptode

Other

Maximum plate voltage
300 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
1.5 V
ClassA
Plate current
3 mA
ClassA
Screen current
7.8 mA
ClassA
Oscillator grid current
0.5 mA
Converter Oscillator
Oscillator cathode resistor
20000 ohm
Converter Oscillator

Characteristic

Plate resistance
1000000 ohm
Published handbook characteristic
Transconductance
475 µS
Published handbook characteristic
Heater/filament voltage
26.5 V
Published heater/filament rating
Heater/filament current
70 mA
Published heater/filament rating

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

Application
Pentagrid mixer / oscillator

Characteristics

Conversion transconductance
475 uS

Data set 03

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

Voltage
25.5 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.
Grid #3 to All -0ther Electrodes (RF Input) — published value 1
3
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #3 to All -0ther Electrodes (RF Input) — published value 2
0
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #3 to All -0ther Electrodes (RF Input) — published value 3
7.5
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate to All Other Electrodes (Mixer Output)
14
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to All Other Electrodes (Osc. Input) 5.8~ — published value 1
1
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to All Other Electrodes (Osc. Input) 5.8~ — published value 2
5.8
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to External Shield and All Other
1
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Electrodes Except Cathode & Grid No.S
2.9
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Cathode d Grid #5 — published value 1
1
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Cathode d Grid #5 — published value 2
5
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Cathode d Grid #5 — published value 3
2.8
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Electrodes Except Grid #1 — published value 1
1
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Electrodes Except Grid #1 — published value 2
15.5
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Pin 1 - Grid No.l — published value 1
1
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Pin 1 - Grid No.l — published value 2
5
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Pin 2 - Cathode,
2
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.
Pin 4 - Heater
4
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
100 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Voltage — published value 3
250 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Voltage — published value 1
26.5 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Voltage — published value 2
100 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Voltage — published value 3
100 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.3 Voltage — published value 1
-0.5 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.3 Voltage — published value 2
-1.5 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.3 Voltage — published value 3
-1.5 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid~Resistor — published value 1
20000 ohm
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid~Resistor — published value 2
20000 ohm
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid~Resistor — published value 3
20000 ohm
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Resistance (Approx.) — published value 1
0.5 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.
Conversion Transconductance — published value 1
270
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Conversion Transconductance — published value 2
455
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Conversion Transconductance — published value 3
475
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Current — published value 1
0.45 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Current — published value 2
2.8 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Current — published value 3
3 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Current — published value 1
1.6 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Current — published value 2
8 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Current — published value 3
7.8 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.l Current — published value 1
0.1 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.l Current — published value 2
0.5 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.l Current — published value 3
0.5 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Total Cathode Current — published value 1
2.15 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Total Cathode Current — published value 2
11.3 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Total Cathode Current — published value 3
11.3 mA
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
100 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Voltage — published value 1
26.5 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grids-No.2 & No.4 Voltage — published value 2
100 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.3 Voltage — published value 1
0 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.3 Voltage — published value 2
0 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.l Voltage — published value 1
0 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid-No.l Voltage — published value 2
0 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Transconductance — published value 1
4500
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Transconductance — published value 2
7200
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Current — published value 1
5.5 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Plate Current — published value 2
27 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
i With grid-X o.3 Dias of -6 vc lts
-6
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRIDS-N'28Ns4 VOLTS=26.5 — published value 1
28 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRIDS-N'28Ns4 VOLTS=26.5 — published value 2
26.5 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRID-N~1 MILLIAMPERES=0.1 — published value 1
1 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

Other

Grid #3 to Plate — published value 1
3 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #3 to Plate — published value 2
0.3 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Grid #3 — published value 1
1 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Grid #3 — published value 2
3 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Grid #3 — published value 3
0.15 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Plate — published value 1
1 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
Grid #1 to Plate — published value 2
0.03 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
PLATE VOLTAGE
300 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRIDS-No.2 d No.4 (SCREEN) VOLTAGE
100 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRIDS-No.2 d No.4 SUPPLY VOLTAGE
300 V
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
PLATE DISSIPATION
1 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRIDS-No.2 3 No.4 DISSIPATION — published value 1
3 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
GRIDS-No.2 3 No.4 DISSIPATION — published value 2
1 mA
Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.
TOTAL CATHODE CURRENT
14 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.