Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Pentode - Remote Cutoff (single) ·Pentode

6SK7

Remote-cutoff pentode designed for RF and IF amplifier service. Its variable-mu characteristic provides smooth automatic gain control, making it a standard controlled-gain receiver signal tube.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
RTMA 8N
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

The 6SK7 is a Pentode intended for remote-cutoff RF/IF 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
RTMA 8N
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

RTMA 8N - 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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
800000 Ω
Transconductance
0.002 S
Max plate voltage
300 V
Max screen voltage
125 V
Max plate dissipation
4 W
Max screen dissipation
0.4 W

RCA 6SK7 remote-cutoff metal single-ended RF/IF amplifier pentode suitable for AVC; RMA 1938 and JETEC 1950. Heater 6.3 V 0.3 A, coated unipotential cathode, octal 8-pin, basing 8N. Pins 1 shell/internal shield, 2 heater, 3 suppressor grid3, 4 control grid1, 5 cathode, 6 screen grid2, 7 heater, 8 plate. 1938 at Va 250 V Vg2 100 V: plate current 9.2 mA, screen current 2.4 mA, gm 2000 µmhos (0.002 A/V), rp 0.8 MΩ; at Va 100 V: Ia 8.9 mA, Ig2 2.6 mA, gm 1900 µmhos, rp 0.25 MΩ. Grid bias about -35 V for gm 10 µmhos. Grid-plate capacitance max ~0.005 pF (1938), 1950 ~0.003 pF; input 6 pF, output 7 pF. JETEC max plate 300 V, screen supply max 300 V subject to operating restrictions, screen dissipation 0.4 W. Suppressor externally tied to cathode at socket.

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

Pentode

Other

  • The 65J7 and the 65Kk7 are two new metal r~f amplifier pentodes featur

    65

    The 65J7 and the 65Kk7 are two new metal r~f amplifier pentodes featur-

  • amplifier operation, (5) greater uniformity of ain in amplifiers,(6) hn?her

    6

    amplifier operation, (5) greater uniformity of ain in amplifiers,(6) hn?her

  • HEATER VOLTAGE (A.C. or D.C.)

    6.3 V

    HEATER VOLTAGE (A.C. or D.C.) 6.3 Volts

  • HEATER CURRENT o

    300 mA

    HEATER CURRENT o 0.3 Ampere

  • Grid to Plate 0.005 max. uuf

    0.005 pF

    Grid to Plate 0.005 max. uuf

  • Heater Voltage 6.3

    6.3 V

    Heater Voltage 6.3 6.3 Volts

  • Plate vVoltage 100 250 max. Volts

    250 V

    Plate vVoltage 100 250 max. Volts

  • screen voltage 100 max. 100 max. Volts

    100 V

    screen voltage 100 max. 100 max. Volts

  • Grid voltage -3 - Volts

    -3 V

    Grid voltage -3 - Volts

  • Plate Current 2.9

    3 mA

    Plate Current 2.9 3.0 Milliamperes

  • screen Current 0.9

    0.8 mA

    screen Current 0.9 0.8 Milliamperes

  • Amplification Factor (Approx.)

    2500

    Amplification Factor (Approx.) 1100 2500

  • HEATER CURRENT ° 0,

    3 A

    HEATER CURRENT ° 0,3 Ampere

  • Grid to Plate 0,005 sax. uuf

    5 pF

    Grid to Plate 0,005 sax. uuf

  • Plate voltage 100 250 max., Volts

    250 V

    Plate voltage 100 250 max., Volts

  • screen vVoltage 100 sax. 100 max. Volts

    100 V

    screen vVoltage 100 sax. 100 max. Volts

  • Grid voltage -3 min, -3 ain, Volts

    -3 V

    Grid voltage -3 min, -3 ain, Volts

  • Plate Current 8.9

    9.2 mA

    Plate Current 8.9 9.2 Milliamperes

  • screen Current 2.6

    2.4 mA

    screen Current 2.6 2.4 Milliamperes

  • Amplification Factor (Approx.)

    1600

    Amplification Factor (Approx.) 875 1600

  • ductance = 10 micromhos

    -35 V

    ductance = 10 micromhos - -35 volts

  • E; 6.3 VOLTS "SCREEN VOLTS

    6.3 V

    E; 6.3 VOLTS "SCREEN VOLTS

  • SUPPRESSOR VOLTS =

    0 V

    SUPPRESSOR VOLTS = 0

  • ©_ ® o o o o 603

    603 V

    ©_ ® o o o o 603 603 volts

  • Heater VOlt&ge (ac or dc)o

    90 V

    Heater VOlt&ge (ac or dc)o 90 volts

  • Maximum heater=-cathode vOltage . «

    300 V

    Maximum heater=-cathode vOltage . « 300 volts

  • o o o o ¢ o o o Plate

    300 V

    o o o o ¢ o o o Plate 300 volts

  • Meaximum grid #2 supply VOltage . « ¢ « o See J

    2 V

    Meaximum grid #2 supply VOltage . « ¢ « o See J5-Ch

  • Meximum grid #2 vOltage . . o « o « o o ¢ o« Pip #3 conpected toi. o o s o s o o o o o o Plate Catho

    3 V

    Meximum grid #2 vOltage . . o « o « o o ¢ o« Pip #3 conpected toi. o o s o s o o o o o o Plate Cathode

  • Maximum grid #3 voltage,

    2.5 V

    Maximum grid #3 voltage, 2.5 watts

  • o ¢ o o o o 0 (o} volts

    0 V

    o ¢ o o o o 0 (o} volts

  • Maximm positive dc grid #1 voltage. . . ¢ o 1.0 1,

    0 V

    Maximm positive dc grid #1 voltage. . . ¢ o 1.0 1,0 megohm

  • Heator voltage. . ¢ « ¢ ¢ ¢ o o o 6.3 6-3 603

    603 V

    Heator voltage. . ¢ « ¢ ¢ ¢ o o o 6.3 6-3 603 603 volts

  • Plate VOLtAEE o « o« o o o o o o » 180 250 100

    250 V

    Plate VOLtAEE o « o« o o o o o o » 180 250 100 250 volts

  • Grid #2 voltage . . . « « « o« « o Plate Plate 100

    1100 V

    Grid #2 voltage . . . « « « o« « o Plate Plate 100 1,100 volts

  • Grid #l VOItage . ¢« ¢« ¢ ¢ o o o N ~6 "805 -3

    -3 V

    Grid #l VOItage . ¢« ¢« ¢ ¢ o o o N ~6 "805 -3 -3 volts

  • Grid #3 voltage,. . « » « « » « o Plate Plate Pin #3 connected to pin #

    5 V

    Grid #3 voltage,. . « » « « » « o Plate Plate Pin #3 connected to pin #5

  • Trangconductance, . « « « « « « o 2300 2500 157

    1650 µS

    Trangconductance, . « « « « « « o 2300 2500 157 1650 pmhos

  • Platoctu'rent..........6 902 209

    3 mA

    Platoctu'rent..........6 902 209 3 ma

  • , . o e ¢ o ¢ o o = - 0.9

    8 mA

    , . o e ¢ o ¢ o o = - 0.9 . 008 ma

  • Grid #1 voltage (approx )for

    1 V

    Grid #1 voltage (approx )for

  • = l0ua +8

    -8 V

    = l0ua +8 -8 volts

  • Heater voltage (ac or dC) @ o 6 6 6 6 6 @ & 8 0 0 8 0 0 ¢ 0 o s 0 e . «

    6.3 V

    Heater voltage (ac or dC) @ o 6 6 6 6 6 @ & 8 0 0 8 0 0 ¢ 0 o s 0 e . « 6.3 voOlts

  • VOLt&Z® . « « o « » o ¢« ¢« s s s s s o ¢« o o o «

    0 V

    VOLt&Z® . « « o « » o ¢« ¢« s s s s s o ¢« o o o « 0 volts

  • LJ L] L] L] * ® @ L] * ® [d * L] L4 * . * ] *

    300 V

    LJ L] L] L] * ® @ L] * ® [d * L] L4 * . * ] * 300 volts

  • Maxm 31'1(1 #2 Bupply VOltage e 0 o6 @ & o ¥ * 6 06 o 0 © o 6 o o o

    300 V

    Maxm 31'1(1 #2 Bupply VOltage e 0 o6 @ & o ¥ * 6 06 o 0 © o 6 o o o 300 volts

  • Ma-xmm grid#e Voltage. ® o @ °® @ & 6 ¢ ® o 6 o © & o 6 0 o ° ¢ o o o see J

    0 V

    Ma-xmm grid#e Voltage. ® o @ °® @ & 6 ¢ ® o 6 o © & o 6 0 o ° ¢ o o o see J5-Ch

  • Maximum grid #2 digsipation. . ¢« ¢ o o ¢ ¢ o ¢ o o s 0 o 0 o o o oo o

    4 W

    Maximum grid #2 digsipation. . ¢« ¢ o o ¢ ¢ o ¢ o o s 0 o 0 o o o oo o 04 watts

  • Maximun pogitive dc grid #1 vOltBgE. « & « o ¢ o ¢ s ¢ ¢ 6 o o o o o o O volts

    6 V

    Maximun pogitive dc grid #1 vOltBgE. « & « o ¢ o ¢ s ¢ ¢ 6 o o o o o o O volts

  • Heater vOltage o « « o o ¢ ¢ ¢ ¢ o ¢ ¢ ¢ 6 06 6 06 0 0 0.0 0 00 . 6.3 6,

    3 V

    Heater vOltage o « « o o ¢ ¢ ¢ ¢ o ¢ ¢ ¢ 6 06 6 06 0 0 0.0 0 00 . 6.3 6,3 volts

  • Phte voltage. * L] [] L] * L4 L L4 Ld LJ L] ® L4 * ® L] [J L] L [ * LJ Ld L] L] lw

    250 V

    Phte voltage. * L] [] L] * L4 L L4 Ld LJ L] ® L4 * ® L] [J L] L [ * LJ Ld L] L] lw 250 volta

  • Grid #2 voltaseo @€ ¢ 6 6 0 6 6 6 © ° 0 0 & 0 6 0 0 0 0 s 9 2 s 0 100

    100 V

    Grid #2 voltaseo @€ ¢ 6 6 0 6 6 6 © ° 0 0 & 0 6 0 0 0 0 s 9 2 s 0 100 100 volts

  • Grid #1 v°1tage e ¢ 0 ® ¢ ¢ 0 0 ® 0 0 0 @ 6 ° 0 e 0 0 0 0 v 0 o 0 -1

    -3 V

    Grid #1 v°1tage e ¢ 0 ® ¢ ¢ 0 0 ® 0 0 0 @ 6 ° 0 e 0 0 0 0 v 0 o 0 -1 . -3 volts

Characteristic

  • Plate Resistance (Approx.) 0.7

    1.5 ohm

    Plate Resistance (Approx.) 0.7 1.5 Megohms

  • Transconductance 1575

    1650 µS

    Transconductance 1575 1650 Micromhos

  • Plate Resistance (Approx. 0.25

    0.8 ohm

    Plate Resistance (Approx. 0.25 0.8 Megohm

  • Transconductance 1900

    2000 µS

    Transconductance 1900 2000 Micromhos

  • Plate resistance. . « « « « « o o 00082 .0076 6.7 >

    1 ohm

    Plate resistance. . « « « « « o o 00082 .0076 6.7 >1.0 megohm

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Data set 03

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    300 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    125 V

  • Maximum Plate Dissipation

    4 W

Characteristic

  • Transconductance

    2000 µS

    Typical

  • Plate Resistance

    800000 ohm

    Typical

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Maximum screen voltage

    150 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA OperatingPoint1

  • Screen voltage

    100 V

    ClassA OperatingPoint1

  • Control-grid bias

    3 V

    ClassA OperatingPoint1

  • Plate current

    9.2 mA

    ClassA OperatingPoint1

  • Screen current

    2.6 mA

    ClassA OperatingPoint1

  • Plate voltage

    100 V

    ClassA OperatingPoint2

  • Screen voltage

    100 V

    ClassA OperatingPoint2

  • Control-grid bias

    1 V

    ClassA OperatingPoint2

  • Plate current

    13 mA

    ClassA OperatingPoint2

  • Screen current

    4 mA

    ClassA OperatingPoint2

Characteristic

  • Plate resistance

    800000 ohm

    ClassA OperatingPoint1

  • Transconductance

    2000 µS

    ClassA OperatingPoint1

  • Plate resistance

    120000 ohm

    ClassA OperatingPoint2

  • Transconductance

    2350 µS

    ClassA OperatingPoint2

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate Resistance

    800000 ohm

    AlternateOperatingPoint

  • Transconductance

    2000 uS

    AlternateOperatingPoint

Data set 06

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

Characteristic

  • Transconductance

    2000 uS

    ClassA

  • Plate resistance

    800000 ohm

    ClassA

  • Plate_current

    9.2 mA

    ClassA

  • Screen_current

    2.5 mA

    ClassA

Capacitance

  • Input capacitance

    3 pF

    Section1

  • Output capacitance

    3 pF

    Section1

Data set 07

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    100 V

    ClassA

  • Grid Voltage

    -3 V

    ClassA

Characteristic

  • Plate Current

    9.2 mA

    ClassA

  • Screen Current

    2.6 mA

    ClassA