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Voltage Pentode - Sharp Cutoff (single) ·Pentode

6SJ7

Sharp-cutoff pentode designed for RF, IF, wide-band, or high-frequency voltage-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Sharp-cutoff RF pentode.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: RETMA 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

RETMA 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: 1500000 Ω
Transconductance: 0.00165 S
Max plate voltage: 300 V
Max screen voltage: 100 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.7 W

RCA 6SJ7 sharp-cutoff metal single-ended RF amplifier pentode; 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 3.0 mA, screen 0.8 mA, gm 1650 µmhos (0.00165 A/V), rp approx 1.5 MΩ; at Va 100 V: Ia 2.9 mA, Ig2 0.9 mA, gm 1575 µmhos, rp 0.7 MΩ. 1950 JETEC max plate 300 V, plate dissipation 2.5 W, screen supply max 300 V under ratings conditions, heater-cathode max 90 V; earlier 1938 tentative plate maximum 250 V. Pentode grid-plate capacitance max 0.005 pF, input 6 pF, output 7 pF. Suppressor externally connected to cathode at socket; screen voltage ratings depend on specified circuit/operating conditions.

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

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

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
2.5 W

Characteristic

Transconductance
1650 µS
Typical
Plate Resistance
1000000 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
3 mA
ClassA OperatingPoint1
Screen current
0.8 mA
ClassA OperatingPoint1
Plate voltage
100 V
ClassA OperatingPoint2
Screen voltage
100 V
ClassA OperatingPoint2
Control-grid bias
3 V
ClassA OperatingPoint2
Plate current
2.9 mA
ClassA OperatingPoint2
Screen current
0.9 mA
ClassA OperatingPoint2
Triode-connected plate voltage
250 V
TriodeConnection ClassA
Triode-connected control-grid bias
8.5 V
TriodeConnection ClassA
Triode-connected plate current
9.2 mA
TriodeConnection ClassA
Triode-connected plate voltage
180 V
TriodeConnection ClassA
Triode-connected control-grid bias
6 V
TriodeConnection ClassA
Triode-connected plate current
6 mA
TriodeConnection ClassA

Characteristic

Plate resistance
1000000 ohm
ClassA OperatingPoint1
Transconductance
1650 µS
ClassA OperatingPoint1
Plate resistance
700000 ohm
ClassA OperatingPoint2
Transconductance
1575 µS
ClassA OperatingPoint2
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating
Triode-connected plate resistance
7600 ohm
TriodeConnection
Triode-connected transconductance
2500 µS
TriodeConnection
Triode-connected amplification factor
19
TriodeConnection
Triode-connected plate resistance
8200 ohm
TriodeConnection

Data set 05

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Cutoff characteristic
Sharp cutoff

Data set 06

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Resistance
1500000 ohm
AlternateOperatingPoint
Transconductance
1650 uS
AlternateOperatingPoint

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
3 mA
ClassA
Screen Current
0.8 mA
ClassA

Data set 08

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Voltage
6.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current
300 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.i to Plate — published value 1
2.8
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.i to Plate — published value 2
2.8
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.l to Cathode — published value 1
3
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.l to Cathode — published value 2
3.4
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate to Cathode — published value 1
11
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate to Cathode — published value 2
11
Published datasheet value; multiple values represent separate source-table limits or conditions.
(6SJ7, Shell — published value 1
6
Published datasheet value; multiple values represent separate source-table limits or conditions.
(6SJ7, Shell — published value 2
4
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 1 6SJ7-GT, — published value 1
1
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 1 6SJ7-GT, — published value 2
6
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 1 6SJ7-GT, — published value 3
5
Published datasheet value; multiple values represent separate source-table limits or conditions.
Base Sleeve
6
Published datasheet value; multiple values represent separate source-table limits or conditions.
~"1 Pin 2 -Heater — published value 1
1
Published datasheet value; multiple values represent separate source-table limits or conditions.
~"1 Pin 2 -Heater — published value 2
2
Published datasheet value; multiple values represent separate source-table limits or conditions.
~"1 Pin 2 -Heater — published value 3
7
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin3-Grid No.3
8
Published datasheet value; multiple values represent separate source-table limits or conditions.

Other

Grid No.l to Plate — published value 1
0.005 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.l to Plate — published value 2
0.005 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
'PLATE VOLTAGE
300 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-No.2 (SCREEN) VOLTAGE
125 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRIC-No.2 SUPPLY VOLTAGE
300 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE DISSIPATION
2.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-No.2 DISSIPATION
0.1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Positive bias value
0 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
negative with respect to cathode
90 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater positive with respect to cathode
90 V
Published datasheet value; multiple values represent separate source-table limits or conditions.