Data set 01
1938 Triadyne
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate Current
45 mA
At 110 V plate
Grid Current
7 mA
At 110 V plate
Power Output
2 W
ClassA;DynamicCoupled
Power - Triode ·Triode
25AC5GT
High-mu audio-output power triode for low-voltage and transformerless receiver circuits. Published data includes dynamically coupled Class A operation and push-pull Class B service, where a pair can produce approximately 6 W.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 60
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 25 V / 300 mA
Description
A 25 V, 0.3 A positive-grid power-amplifier triode intended for series-heater AC-DC receivers and dynamic-coupled Class A operation. The source bulletin labels the device 25AC5G.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 60
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 25 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
60 - 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
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 15200 Ω
- Transconductance
- 0.0028 S
- Amplification factor
- 48
- Max plate voltage
- 180 V
- Max plate dissipation
- 10 W
Source labels the device 25AC5G; approved batch designation 25AC5GT retained.
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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
180 V
ClassB;PushPull;TwoTubes
Grid voltage
0 V
ClassB;PushPull;TwoTubes
Zero-signal plate current per tube
4 mA
ClassB;PushPull;TwoTubes
Peak input signal power
0.81 W
ClassB;PushPull;TwoTubes
Plate-to-plate load resistance
4800 ohm
ClassB;PushPull;TwoTubes
Power output
6 W
ClassB;PushPull;TwoTubes
Data set 03
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate Voltage
110 V
Power Output
2.7 W
DynamicCoupledClassA;Driver=37
Characteristic
Plate Current
45 mA