6SQ7GTG

Double-diode triode combining radio detector and AVC rectification with subsequent voltage amplification. The paired diodes handle signal and control-voltage functions while the triode provides receiver audio or voltage gain.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

GT/G envelope version of the 6SQ7 duplex-diode high-mu triode.

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: 300 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

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 2 mA

Diode section 1.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 2 mA

Diode section 2.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 91000 Ω
Transconductance: 0.0011 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 0.5 W
Max cathode current: 5 mA

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

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Heater voltage
6.3 V
Heater current
300 mA
Peak inverse voltage
125 V
EachDiode
Average diode current
2 mA
EachDiode

SECTION 2

Diode

Other

Peak inverse voltage
125 V
EachDiode
Average diode current
2 mA
EachDiode

SECTION 3

Triode

Other

Plate voltage
250 V
Triode
Grid voltage
-2 V
Triode
Plate current
0.9 mA
Triode
Maximum plate voltage
300 V
Triode

Characteristic

Amplification factor
100
Triode
Plate resistance
91000 ohm
Triode
Transconductance
1100 uS
Triode

Capacitance

Grid-to-plate capacitance
1.8 pF
Triode