Data set 01
1937 Osram Valves
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Optimum load resistance
4500 ohm
Published operating data
Power output
32 W
Published operating data
Power - Triode ·Triode
PX25A
High-transconductance development of the OSRAM PX25 directly heated power triode. Approximately 25 W plate dissipation and increased transconductance provide stronger drive and gain for high-quality audio power stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B4
- Base pins
- 4
- Nominal heater
- 4 V / 2 A
Description
OSRAM PX25A triode for amplification, detection, or power-output service as specified in the supplied datasheet.
Socket description
European 4-pin base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B4
- Base pins
- 4
- Nominal heater voltage
- 4 V
- Nominal heater current
- 2 A
- 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
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 860 Ω
- Transconductance
- 0.0137 S
- Amplification factor
- 12
- Max plate voltage
- 400 V
- Max plate dissipation
- 25 W
Published ratings and characteristics promoted from the approved datasheet.
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
193X Osram
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater/Filament Voltage
4 V
Published datasheet value
Heater/Filament Current
2 A
Published datasheet value
Maximum Anode Voltage
400 V
Published datasheet value
Maximum Anode Dissipation
25 W
Published datasheet value
Characteristics
Plate Resistance
860 ohm
Published datasheet value
Mutual Conductance
13700 µS
Published datasheet value
Amplification Factor
12
Published datasheet value