Voltage Pentode - High Frequency (single) ·Pentode
5AI28B
RF pentode documented by Standard Valves for high-frequency signal amplification. Its manufacturer classification establishes radio-frequency amplifier service rather than power output, although the surviving description does not justify a narrower cutoff classification.
- Sections
- 1
- Base
- -
- Socket code
- B5
- Base pins
- 5
- Nominal heater
- 4 V / 1 A
Description
RF pentode.
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
- 1 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
Pentode
- Plate resistance
- 800000 Ω
- Max plate voltage
- 250 V
- Max screen voltage
- 100 V
- Max cathode current
- 9 mA
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.