Voltage Tetrode ·Tetrode
4AI37B
Directly heated coplanar-grid tetrode with a heavy five-volt filament. Available source material identifies its specialized grid geometry without establishing a narrower functional category.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B5
- Base pins
- 5
- Nominal heater
- 5 V / 1.6 A
Description
Coplanar-grid tetrode.
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
- 5 V
- Nominal heater current
- 1.6 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
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 3600 Ω
- Amplification factor
- 5.3
- Max plate voltage
- 250 V
- Max cathode current
- 45 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.