Power - Pentode (NOT beam) ·Pentode
PT425
Marconi power pentode for receivers using a single low-frequency stage, combining gain and output capability.
- Sections
- 1
- Base
- -
- Socket code
- B5
- Base pins
- 5
- Nominal heater
- 4 V / 250 mA
Description
Power pentode for receivers having a single low-frequency stage.
Socket description
European 5-pin base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B5
- Base pins
- 5
- Nominal heater voltage
- 4 V
- Nominal heater current
- 250 mA
- 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
Pentode
- Plate resistance
- 50000 Ω
- Transconductance
- 0.002 S
- Max plate voltage
- 200 V
- Max screen voltage
- 150 V
Published ratings/characteristics promoted from the approved datasheet where legible.
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.