Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Diode
Characteristic
Heater Voltage
6.3 V
Heater Current
300 mA
SECTION 3
Triode
Characteristic
Amplification Factor
70
Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode
6Q7GT
Compact GT-envelope double-diode high-mu triode for detector, AVC, and audio voltage-amplifier functions. Two diode plates provide signal and control rectification while the triode supplies subsequent gain.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- InternationalOctal
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
GT-envelope double-diode high-mu triode for detector, AVC, and first audio-frequency service.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- InternationalOctal
- 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
InternationalOctal - 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
- 200 V
- Max cathode current
- 10 mA
- Rectifier nominal output current
- 10 mA
Published ratings and characteristics promoted where clearly legible in the approved source.
Section 2
Diode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 200 V
- Max cathode current
- 10 mA
- Rectifier nominal output current
- 10 mA
Promoted values and additional parameters were taken from the supplied Ferranti datasheet tables.
Section 3
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 58000 Ω
- Transconductance
- 0.0012 S
- Amplification factor
- 70
- Max plate voltage
- 250 V
Published ratings and characteristics promoted where clearly legible in the approved source.
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 02
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Diode
Application
Application
Signal detection
SECTION 3
Triode
Application
Application
Audio-frequency amplification
Data set 03
1961 Ferranti Technical Handbook
Published operating points and test conditions from this source.
SECTION 1
Diode
Other
Diode plate voltage maximum
200 V
Diode1
Diode current maximum
10 mA
Diode1
SECTION 2
Diode
Other
Diode plate voltage maximum
200 V
Diode2
Diode current maximum
10 mA
Diode2
SECTION 3
Triode
Other
Plate voltage
100 V
ClassA
Control-grid voltage
-1 V
ClassA
Plate current
0.8 mA
ClassA
Plate voltage
250 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
1 mA
ClassA
Peak output voltage
49 V
ResistanceCoupledAmplifier;Va=250V
Stage gain
56 ratio
ResistanceCoupledAmplifier;Va=250V
Characteristics
Transconductance
1200 uS
ClassA
Plate resistance
58000 Ohm
ClassA
Amplification factor
70 ratio
ClassA
Capacitance
Input capacitance
2 pF
6Q7G
Input capacitance
1.8 pF
6Q7GT
Output capacitance
4 pF
6Q7G
Output capacitance
3.4 pF
6Q7GT