Voltage Pentode ·Pentode
20F2
Series-heater screened pentode designed for television receiver amplification service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 11 V / 200 mA
Description
Television screened pentode for series operation.
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
- 11 V
- Nominal heater current
- 200 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
X-ray radiationInterelectrode capacitances
- Plate resistance
- 125000 Ω
- Transconductance
- 0.0106 S
- Amplification factor
- 33
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 4 W
- Max screen dissipation
- 1 W
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.