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6SF5

General-purpose triode for voltage amplification or electronic service as documented by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 6AB
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

The 6SF5 is a Triode intended for high-mu voltage-amplifier service. Published ratings, characteristics and typical operating data from the supplied datasheet were captured.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 6AB
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

6AB - 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

Plate resistance: 66000 Ω
Transconductance: 0.0015 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 0.3 W

Published promoted fields populated from printed headings; identical repeated sections compressed.

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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HEATER VOLTAGE (A.C. or D.C.)
6.3 V
HEATER VOLTAGE (A.C. or D.C.) 6.3 Volts
HEATER CURRENT °
300 mA
HEATER CURRENT ° 0.3 Ampere
Grid to Plate
2.6 pF
Grid to Plate 2.6 uuf
Heater Voltage
6.3 V
Heater Voltage 6.3 Volts
Plate voltage 250 msax. Volts
250 V
Plate voltage 250 msax. Volts
Grid voltage
-2 V
Grid voltage -2 Volts
Amplification Factor
100
Amplification Factor 100
Plate Current
0.9 mA
Plate Current 0.9 Milliampere
Heater voltage , . . . . o c s e o s 0 s
6.3 V
Heater voltage , . . . . o c s e o s 0 s 6.3 volts
Maximum plate voltage. . . e o o ¢ ¢ s o
30 V
Maximum plate voltage. . . e o o ¢ ¢ s o 30 volte
Maximum heater-cathode voltage ., e s s 00 s«
9 V
Maximum heater-cathode voltage ., e s s 00 s« 9 volts
Heater voltage , . , . e « 6.3
6.3 V
Heater voltage , . , . e « 6.3 6.3 volts
Heater current , ., , . o o+ 300
300 mA
Heater current , ., , . o o+ 300 300 ma
Plate voltage, . . ., « o 100
250 V
. Plate voltage, . . ., « o 100 250 volts
Grid voltage., . . . ® o ‘l
-2 V
Grid voltage., . . . ® o ‘l -2 voltﬂ
Amplification factor . o
100
Amplification factor . o 100 100
Trarsconductance , ., o o 1150
1500
Trarsconductance , ., o o 1150 1500 umhos
Plate gurrent, . ., . « o Ob
0.9 mA
Plate gurrent, . ., . « o Ob 0.9 ma
Heater voltage . , . o o 0 6.3 6.3 6.3
6.3 V
Heater voltage . , . o o 0 6.3 6.3 6.3 6.3 volte
Plate supply voltage , ., - 100 100 300
300 V
Plate supply voltage , ., - 100 100 300 300 volts
Control grid voltage , . 0 0 0
0 V
Control grid voltage , . 0 0 0 0 volts
Plate load resistor, . .; 0.25 0.25 0.25
0.25 ohm
Plate load resistor, . .; 0.25 0.25 0.25 0.25 megohm
Control grid resistor, .. 10 10 10
10 ohm
Control grid resistor, .. 10 10 10 10 megohm.
Grid resistor of following atage 0.5 1.0 0.5 1,
0 ohm
Grid resistor of following atage 0.5 1.0 0.5 1,0 megohm
Signal source impedance, . 0 0 0
0 ohm
Signal source impedance, . 0 0 0 0 ohms
Output voltage (r.a.s.)
7 V
Output voltage (r.a.s.). . 7
8.5 Ll
50 V
8.5 Ll 50 volts
Voltage gain , . ., . . . . L8 52
66 V
Voltage gain , . ., . . . . L8 52 66 T

Characteristic

Plate Resistance
66000 ohm
Plate Resistance 66000 Ohms
transconductance
1500 µS
transconductance 1500 Micromhos
Plate resistance , ., . . 85,000
66000 ohm
Plate resistance , ., . . 85,000 66,000 ohms

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
300 V
Published handbook rating
Plate voltage
250 V
ClassA OperatingPoint1
Control-grid bias
2 V
ClassA OperatingPoint1
Plate current
0.9 mA
ClassA OperatingPoint1
Plate voltage
100 V
ClassA OperatingPoint2
Control-grid bias
1 V
ClassA OperatingPoint2
Plate current
0.4 mA
ClassA OperatingPoint2

Characteristic

Plate resistance
66000 ohm
ClassA OperatingPoint1
Transconductance
1500 µS
ClassA OperatingPoint1
Amplification factor
100
ClassA OperatingPoint1
Plate resistance
85000 ohm
ClassA OperatingPoint2
Transconductance
1150 µS
ClassA OperatingPoint2
Amplification factor
100
ClassA OperatingPoint2
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Resistance
85000 ohm
LowerVoltageOperatingPoint
Transconductance
1150 uS
LowerVoltageOperatingPoint

Data set 04

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
250 V
ClassA

Characteristic

Transconductance
1500 uS
ClassA
Plate resistance
66000 ohm
ClassA
Amplification factor
100
ClassA

Capacitance

Input capacitance
3 pF
Section1
Output capacitance
3 pF
Section1