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6BK4B

High-voltage triode designed for electronic voltage-regulator service, controlling or shunting current to stabilize demanding power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

High-voltage triode intended for shunt-regulator service in very-high-voltage circuits.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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

Transconductance: 0.0002 S
Amplification factor: 2000
Max plate voltage: 27000 V
Max plate dissipation: 40 W
Max cathode current: 1.6 mA

High-voltage shunt-regulator beam triode.

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

Triode

Other

Unregulated DC Supply Voltage Maximum
60000 V
ShuntVoltageRegulator
Regulated DC Output Voltage
25000 V
LoadCurrent=0mA
UnregulatedSupplyVoltageTypical
36000 V
ShuntVoltageRegulator

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

GRID TO PLATE
0.03 pF
Capacitances | GRID TO PLATE 0.03 pf
GRID TO CATHODE AND HEATER
2.6 pF
Capacitances | GRID TO CATHODE AND HEATER 2.6 pf
PLATE TO CATHODE AND HEATER
1 pF
Capacitances | PLATE TO CATHODE AND HEATER 1.0 pf

Characteristic

LIMITS OF APPLIED VOLTAGE-AC OR DC
0.6 V
Average Characteristics | LIMITS OF APPLIED VOLTAGE-AC OR DC 6.3±0.6 VOLTS
HEATER NEGATIVE `NITH RESPECT TO CATHODE
450 V
Average Characteristics | HEATER NEGATIVE `NITH RESPECT TO CATHODE 450 VOLTS

Other

DC PLATE VOLTAGE
27 V
Maximum Ratings | DC PLATE VOLTAGE 27.000 VOLTS
UNREGULATED DC SUPPLY VOLTAGE
60 V
Maximum Ratings | UNREGULATED DC SUPPLY VOLTAGE 60.000 VOLTS
DC PLATE CURRENT
1.6 V
Maximum Ratings | DC PLATE CURRENT 1.6 VOLTS
PLATE DISSIPATION
40 W
Maximum Ratings | PLATE DISSIPATION 40 WATTS
GRID-CIRCUIT RESISTANCE
3 Mohm
Maximum Ratings | GRID-CIRCUIT RESISTANCE 3 MEGOHMS
DC VOLTAGE
36 V
Maximum Ratings | DC VOLTAGE 36.000 VOLTS
EQUIVALENT RESISTANCE
11 Mohm
Maximum Ratings | EQUIVALENT RESISTANCE 11 MEGOHMS
EQUIVALENT RESISTANCE
1 ohm
Maximum Ratings | EQUIVALENT RESISTANCE 1.000 OHMS
EFFECTIVE GRID-PLATE TRANSCONDUCTANCE
200 µMHOS
Maximum Ratings | EFFECTIVE GRID-PLATE TRANSCONDUCTANCE 200 µMHOS
FOR LOAD CURRENT OF
0 mA
Maximum Ratings | FOR LOAD CURRENT OF 0 mA 1.000 µA
FOR LOAD CURRENT OF
1 mA
Maximum Ratings | FOR LOAD CURRENT OF 1 mA 45 µA
FOR LOAD CURRENT OF
0 mA
Maximum Ratings | FOR LOAD CURRENT OF 0 mA 25.000 VOLTS
FOR LOAD CURRENT OF
25 V
Maximum Ratings | FOR LOAD CURRENT OF 0 mA 25.000 VOLTS
FOR LOAD CURRENT OF
1 mA
Maximum Ratings | FOR LOAD CURRENT OF 1 mA 24.500 VOLTS
FOR LOAD CURRENT OF
24.5 V
Maximum Ratings | FOR LOAD CURRENT OF 1 mA 24.500 VOLTS

Data set 03

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater current … If
200 mA
Capacitance de sortie Cs
1 pF
Heater voltage … ….…..……..…mrereeerneneVÉ
6.9 V
Plate voltage. Lecarsceures Vä
27000 V
T'ension d' ahmentatmn non regulee …… VanN
60000 V
Valeur CONtINUE …..….....….….…vervrrrerrocrrnseen
135 V
Valeur de crête (1)
440 V
Plate current
1.6 mA
Dissipation d' anode
40 W
Filament négatif par rapport à la cathode ….-Vfk
450 V
Tension de la source non régulée …… VN
36000 V
Résistance équivalente de là source …… RN
11 MΩ
Résistance RI (5 WattS)
220 MΩ
Résistance R2 (2watts)
1 MΩ
Résistance R3 (1/2 watt)
820 kΩ
Tension de référence
200 V
Résistance equ1valente de la source de reference
1000 Ω
Géracasa
0.2 mA/V
Pour un courant de charge de
1 MA
Pour un courant de charge nul… urr VS
25000 V
Pour un courant de charge de 1 mA …… VS
24500 V

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Voltage (AC or DC) — published value 1
6.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Voltage (AC or DC) — published value 2
0.6 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current at 6.3 V — published value 1
6.3
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current at 6.3 V — published value 2
0.2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid to plate
0.03 pF
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid to cathode and heater
2.6 pF
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 2 -Heater
2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 5 -Grid
5
Published datasheet value; multiple values represent separate source-table limits or conditions.
Unregulated DC Supply Voltage
60000 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Dissipation
40
Published datasheet value; multiple values represent separate source-table limits or conditions.
DC Voltage
36000 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Equivalent resistance — published value 1
1000
Published datasheet value; multiple values represent separate source-table limits or conditions.
Equivalent resistance — published value 2
11
Published datasheet value; multiple values represent separate source-table limits or conditions.
Effective Grid-Plate Transconductance
200
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 0 mA — published value 1
0 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 0 mA — published value 2
1000 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 1 mA — published value 1
1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 1 mA — published value 2
45 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 0 mA — published value 1
0 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 0 mA — published value 2
25000 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 1 mA — published value 1
1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
For load current of 1 mA — published value 2
24500 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-Circuit Resistance
3
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid Voltage (I)
-7 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid Voltage 2 — published value 1
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid Voltage 2 — published value 2
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid Voltage 2 — published value 3
-40 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-Voltage Change — published value 1
3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-Voltage Change — published value 2
9 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Note I: With do plate voltage of 30000 volts and do plate current
30000 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Note 2: With do plate voltage of 30000 volts and do plate current — published value 1
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Note 2: With do plate voltage of 30000 volts and do plate current — published value 2
30000 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Note 3: Difference between grid voltage (1) and grid voltage(2) — published value 1
3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Note 3: Difference between grid voltage (1) and grid voltage(2) — published value 2
1 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Note 3: Difference between grid voltage (1) and grid voltage(2) — published value 3
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
The high voltages at which the 6RK4R is operated may 6e — published value 1
6 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
The high voltages at which the 6RK4R is operated may 6e — published value 2
6 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Operation of the 66K4B with a plate voltage ¢hove approximately
66 V
Published datasheet value; multiple values represent separate source-table limits or conditions.

Other

At maximum plate dissipation the plate of the 6BK48 shows
6 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.