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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

6SQ7

Classic double-diode very-high-mu triode for detector, AVC, and first-audio voltage-amplifier service. Paired diodes provide signal and control rectification while the triode supplies substantial voltage gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 8O
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

The 6SQ7 is a DualDiodeTriode intended for detector, AVC and audio-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: 8O
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

8O - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V

Representative row for the two detector diodes; continuous-current rating preserved as parameter.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 85000 Ω
Transconductance: 0.001175 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 0.5 W

Triode promoted characteristics use the 250 V operating point.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
300 mA
Published nominal value
Transconductance
1100 µS
Published operating characteristic

SECTION 2

Triode

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
300 mA
Published nominal value
Transconductance
1100 µS
Published operating characteristic

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Diode

Capacitance

Diode input capacitance
3.2 pF
Diode output capacitance
3 pF

SECTION 2

Triode

Capacitance

Input capacitance
3.2 pF
Output capacitance
3 pF
Grid-plate capacitance
1.6 pF

Other

Plate voltage
250 V
ClassA
Grid voltage
-2 V
ClassA
Plate current
1.1 mA
ClassA

Characteristics

Plate resistance
85000 ohm
ClassA; PlateVoltage=250V
Transconductance
1175 uS
ClassA; PlateVoltage=250V
Amplification factor
100
ClassA; PlateVoltage=250V

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 2

Triode

Characteristic

TriodePlateResistance
110000 ohm
Section2;AlternateOperatingPoint
TriodeTransconductance
900 uS
Section2;AlternateOperatingPoint

Data set 04

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

Detector service
-
Detector

SECTION 2

Triode

Other

Plate voltage
250 V
ClassA

Characteristic

Transconductance
1100 uS
ClassA
Plate resistance
100000 ohm
ClassA
Amplification factor
100
ClassA

Capacitance

Input capacitance
3 pF
Section1
Output capacitance
3 pF
Section1

SECTION 3

Diode

Characteristic

Detector service
-
Detector

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Continuous Diode Current
1 mA
EachDiode

Capacitance

Diode Input Capacitance
2.6 pF
EachDiode
Grid-to-Diode Plate Capacitance Maximum
0.03 pF

SECTION 2

Triode

Other

Plate Voltage
250 V
ClassA

Characteristic

Plate Current
1.2 mA
ClassA