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Specialized - Switching Tube ·BeamSwitchingCommutator

6JH8

Double-plate sheet-beam tube for color-television synchronous detection, burst gating, and switching. Its balanced beam structure supports signal comparison and controlled output selection.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: E9-1
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

The 6JH8 is a double-plate sheet-beam tube using balanced deflectors to steer an electron beam between two plates, making it suited to color-TV synchronous detection, burst gating and other switching functions.

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: E9-1
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

E9-1 - 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

BeamSwitchingCommutator

X-ray radiationInterelectrode capacitances

Transconductance: 0.0044 S
Max plate voltage: 330 V
Max plate dissipation: 3 W
Max cathode current: 33 mA

Representative row for the two balanced plate outputs.

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

BeamSwitchingCommutator

Characteristic

Grid1Transconductance
440 uS
Published average characteristic

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

BeamSwitchingCommutator

Other

Accelerator voltage maximum
330 V
SheetBeam
Accelerator dissipation
1 W
SheetBeam
Plate voltage, each plate
250 V
DeflectorsGrounded
Accelerator voltage
250 V
DeflectorsGrounded
Cathode bias resistor
220 ohm
DeflectorsGrounded
Total plate current
14 mA
DeflectorsGrounded
Accelerator current
1.5 mA
DeflectorsGrounded

Characteristic

Deflector switching voltage maximum
20 V
BalancedDeflectors

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

BeamSwitchingCommutator

Other

AcceleratorDissipation
1 W
Plate Current
14 mA

Data set 04

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

BeamSwitchingCommutator

Other

Voltage (AC or DC)
6.3 V
Published table value column 1
Voltage (AC or DC)
0.6 V
Published table value column 2
Current at heater volts =
6.3 V
Published table value column 1
Current at heater volts =
0.3 V
Published table value column 2
except both plates
7.5 pF
Published table value
Plate No.l to all other electrodes
5 pF
Published table value
Plate No
2 pF
Published table value column 1
Plate No
5 pF
Published table value column 2
Plate No
1 pF
Published table value column 1
Plate No
2 pF
Published table value column 2
Plate No
0.4 pF
Published table value column 3
Plate-No.l Supply Voltage
250 V
Published table value
Plate-No
2 V
Published table value column 1
Plate-No
250 V
Published table value column 2
Grid-No
3 V
Published table value column 1
Grid-No
250 V
Published table value column 2
Cathode Resistor
220 Ω
Published table value
Total Plate Current
14 mA
Published table value
Grid-No
3 mA
Published table value column 1
Grid-No
1.5 mA
Published table value column 2
for total plate µa =
10 V
Published table value column 1
for total plate µa =
-13 V
Published table value column 2
GRID -No
3 VOLTS
Published table value column 1
GRID -No
250 VOLTS
Published table value column 2
PLATE-No.l VOLTS =
250 VOLTS
Published table value
PLATE-No
2 VOLTS
Published table value column 1
PLATE-No
250 VOLTS
Published table value column 2
PLATE-No
1 VOLTS
Published table value column 3
PLATE-No
1 VOLTS
Published table value column 4
GRID-Na
3 VOLTS
Published table value column 1
GRID-Na
250 VOLTS
Published table value column 2
GRID No
2 W
Published table value
PLATE-No. l VOLTS =
250 VOLTS
Published table value
PLATE-No. l VOLTS=
250 VOLTS
Published table value
PLATE -No
2 VOLTS
Published table value column 1
PLATE -No
250 VOLTS
Published table value column 2

Characteristics

Transconductance
4400 µS
Published table value

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

BeamSwitchingCommutator

Capacitance

Grid No.l to All Other Electrodes, Except Both Plates
7.5 pF
Capacitance
Grid No.l to Deflecting Electrode No.l
0.04 pF
Capacitance
Grid No.l to Deflecting Electrode No.2
0.07 pF
Capacitance
Plate No.l to All Other Electrodes
5 pF
Capacitance
Plate No.2 to All Other Electrodes
5 pF
Capacitance
Plate No.l to Plate No.2
0.4 pF
Capacitance
Deflecting Electrode No.l to All Other Electrodes
4.8 pF
Capacitance
Deflecting Electrode No.2 to All Other Elecetrodes
4.8 pF
Capacitance
Deflecting Electrode No. 1 to Deflecting Electrode No.2
0.38 pF
Capacitance
Grid No.l to Plate
0.6 pF
Capacitance
Grid No.l to Cathode. Heater, Grid No.2, and Grid No.3
16 pF
Capacitance

Other

PlateVoltage (Each Plate)
330 V
MaximumRating
Negative value
165 V
MaximumRating
Positive value
165 V
MaximumRating
Grid-No.3 ( Accelerating-Grid) Voltage
330 V
MaximumRating
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
MaximumRating
Cathode Current
33 mA
MaximumRating
For fixed-bias operation
0.1 megohm
MaximumCircuitValue
For cathode-bias operation
0.25 megohm
MaximumCircuitValue
Grid-No.l-Circuit
1 megohm
MaximumCircuitValue
DC Plate Supply Voltage
770 V
MaximumRating
Peak Positive-Pulse Plate Voltage*
6500 V
MaximumRating

Characteristic

Plate-No. 1 Supply Voltage
250 V
Characteristic
Plate-No. 2 Supply Voltage
250 V
Characteristic
Grid-No.3 Voltage
250 V
Characteristic
Cathode-Bias Resistor
220 ohm
Characteristic
Total Plate Current
14 mA
Characteristic
Peak value
200 V
Characteristic;PublishedValue1
Peak value
200 V
Characteristic;PublishedValue2
Average value
100 V
Characteristic;PublishedValue1
Average value
100 V
Characteristic;PublishedValue2
Plate Voltage
5000 V
Characteristic;PublishedValue1
Plate Voltage
55 V
Characteristic;PublishedValue2
Plate Voltage
250 V
Characteristic;PublishedValue3
Plate Voltage
150 V
Characteristic;PublishedValue4
Grid-No.2 (Screen-Grid) Voltage
150 V
Characteristic;PublishedValue1
Grid-No.2 (Screen-Grid) Voltage
150 V
Characteristic;PublishedValue2
Grid-No.2 (Screen-Grid) Voltage
150 V
Characteristic;PublishedValue3
Grid-No.2 (Screen-Grid) Voltage
150 V
Characteristic;PublishedValue4
Grid-No.l (Control-Grid) Voltage
0 V
Characteristic;PublishedValue1
Grid-No.l (Control-Grid) Voltage
-22.5 V
Characteristic;PublishedValue2
Grid-No.l (Control-Grid) Voltage
-22.5 V
Characteristic;PublishedValue3
Plate Resistance (Approx.)
15000 ohm
Characteristic
Transconductance
7300 uS
Characteristic
Plate Current
345 mA
Characteristic;PublishedValue1
Plate Current
65 mA
Characteristic;PublishedValue2
Grid-No.2 Current
30 mA
Characteristic;PublishedValue1
Grid-No.2 Current
1.8 mA
Characteristic;PublishedValue2
current of 1 #A
100 V
Characteristic;PublishedValue1
current of 1 #A
-42 V
Characteristic;PublishedValue2