Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Power output
0.117 W
Power - Pentode (NOT beam) ·Pentode
1A5GT
Low-drain directly heated battery power pentode providing approximately 115 mW Class-A audio output from about 90 V.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 6X
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 1.4 V / 50 mA
Description
The 1A5GT is a power amplifier pentode using a 1.4 V, 0.05 A filament. Published maximum ratings and Class A characteristics are preserved from the supplied table.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 6X
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 50 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
6X - 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
- 300000 Ω
- Transconductance
- 0.00085 S
- Amplification factor
- 255
- Max plate voltage
- 110 V
- Max screen voltage
- 110 V
- Max cathode current
- 6 mA
Power amplifier pentode.
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
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Pentode
CrossReference
Equivalent electrical characteristics
1A5G
Data set 03
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate Voltage
90 V
Plate Current
4 mA
Screen Voltage
90 V
Screen Current
0.8 mA
Control Grid Voltage
-4.5 V
Optimum Load
25000 ohm
Power Output
0.115 W
Characteristic
Plate Resistance
300000 ohm
Transconductance
850 µS
Amplification Factor
255
Data set 04
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
90 V
ClassA
Screen voltage
90 V
ClassA
Grid voltage
-4.5 V
ClassA
Plate current
4 mA
ClassA
Screen current
0.8 mA
ClassA
Load resistance
25000 ohm
ClassA
Power output
0.115 W
ClassA
Plate voltage
85 V
ClassA
Screen voltage
85 V
ClassA
Grid voltage
-4.5 V
ClassA
Plate current
3.5 mA
ClassA
Screen current
0.7 mA
ClassA
Transconductance
800 uS
ClassA
Load resistance
25000 ohm
ClassA
Power output
0.1 W
ClassA
Data set 05
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
90 V
ClassA
Load resistance
25000 ohm
ClassA
Power output
115 mW
ClassA