Data set 01
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristic
Forward-voltage-drop test current
250 mA
TVDamper
Rectifier - Damper Diode ·Rectifier
25AX4GT
Heater-cathode damper diode designed for television horizontal-frequency circuits and direct-drive service, with high pulse-voltage capability.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 4G
- Socket code
- IO
- Base pins
- 6
- Nominal heater
- 25 V / 300 mA
Description
Heater-cathode damper diode for television horizontal-frequency circuits and direct-drive service.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 4G
- Socket code
- IO
- Base pins
- 6
- Nominal heater voltage
- 25 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
4G - 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
Rectifier
X-ray radiationInterelectrode capacitances
- Rectifier peak inverse voltage
- 4000 V
- Rectifier nominal output current
- 125 mA
- Rectifier peak forward current
- 600 mA
- Rectifier forward voltage drop
- 32 V
- Rectifier max heater-cathode voltage
- 4000 V
- Rectifier warm-up time
- 11 s
Abbreviated heater variant of 6AXQGT; parent electrical table not available locally, so unsupported promoted values were not invented.
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
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Other
MaximumTransientPeakPlateCurrent
3 A
MaximumPeakHeaterCathodeVoltageNegative
4000 V
MaximumPeakHeaterCathodeVoltagePositive
100 V
Characteristic
Tube Voltage Drop
32 V
PlateCurrent=250mA
Capacitance
Heater To Cathode Capacitance
7.5 pF
Data set 03
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Other
Peak inverse voltage
5000 V
Peak plate current
1000 mA
DC plate current
165 mA
Capacitance
Heater-to-cathode capacitance
4 pF
Plate-to-cathode/heater capacitance
5 pF
Data set 04
1965 Westinghouse Data Book
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristics
Heater Voltage
25 V
Heater Current
300 mA
Voltage Drop
32 V
PlateCurrent=250mA
Heater-to-Cathode Capacitance
4 pF
Plate-to-Cathode-and-Heater Capacitance
5 pF
Cathode-to-Plate-and-Heater Capacitance
8.5 pF
Other
Peak Inverse Voltage
4400 V
DamperService
Peak Plate Current
750 mA
DC Plate Current
125 mA
Plate Dissipation
4.8 W
Maximum Heater-Cathode Voltage Cathode Positive
4400 V
TotalDCPlusPeak
Data set 05
1966 Tung Sol Electronic Tubes 3 of 4
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Other
Peak inverse plate voltage
4000 V
DamperService
Steady state peak plate current
600 mA
DamperService
DC output current
125 mA
DamperService
Peak heater-cathode voltage
4000 V
HeaterNegative
Transient peak plate current
3 A
DamperService
Capacitance
Heater-to-cathode capacitance
4.5 pF
Data set 06
1971 RCA HB3 Binder 5 of 7
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristics
Heater voltage
25 V
Nominal heater rating from supplied sheet
Heater current
300 mA
Nominal heater rating from supplied sheet
Warm-up time
11 s
Average warm-up time from supplied sheet