Data set 01
2026 Genalex Rebrand
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Plate Current
52 to 68 mA
Plate 303 V; grid -58 V
Other
Power Output
5.5 W
Plate 303 V; load 2.4 kohm; ClassA;OneTube
Power - Triode ·Triode
PX300B
Modern directly heated audio power triode in the 300B tradition. Approximately 40 W plate dissipation, low amplification factor, and moderate plate voltage support several watts of single-ended Class A output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 5 V / 1.25 A
Description
Directly heated coated-filament power triode for low-frequency power amplification.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 5 V
- Nominal heater current
- 1.25 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
- Transconductance
- 0.0045 S
- Amplification factor
- 3
- Max plate voltage
- 450 V
- Max plate dissipation
- 40 W
- Max cathode current
- 100 mA
Published ratings and characteristics promoted from 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.