Data set 01
1940 Taylor Tubes
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Plate-to-grid capacitance
14 pF
Grid-to-filament capacitance
7 pF
Plate-to-filament capacitance
6 pF
Power - Triode ·Triode
211D
Filamentary transmitting triode intended for radio-frequency amplification and oscillation, with power-service operating data characteristic of the 211 family. It is a high-voltage power device rather than a receiving triode.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- JUMBO4B
- Base pins
- 4
- Nominal heater
- 10 V / 3.25 A
Description
The Amperex HF140 is a radiation-cooled transmitting triode intended for RF power amplifier/oscillator and AF power amplifier/modulator service.
Socket description
Super Jumbo 4-pin bayonet
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- JUMBO4B
- Base pins
- 4
- Nominal heater voltage
- 10 V
- Nominal heater current
- 3.25 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
- Plate resistance
- 3500 Ω
- Transconductance
- 0.0045 S
- Amplification factor
- 12
- Max plate voltage
- 1250 V
- Max plate dissipation
- 100 W
Promoted fields mapped from published ratings/characteristics; additional published values preserved in parameter table.
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.
Data set 02
1953 Amperex
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater/Filament Voltage
10 V
Published datasheet value
Heater/Filament Current
3.25 A
Published datasheet value
Maximum Plate/Anode Voltage
1250 V
Published datasheet value
Maximum Plate/Anode Dissipation
100 W
Published datasheet value
Characteristic
Transconductance
4500 µS
Published datasheet value
Amplification Factor
12
Published datasheet value
Data set 03
2026 Western Electric 200s
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Normal fi l a m e n t current
3 amperes
Normal fi l a m e n t current 3 amperes
Normal fi l a m e n t voltage
10 volt
Normal fi l a m e n t voltage 10 volts
Normal plate current for plate voltage
750 volt
Normal plate current for plate voltage 750 volts and grid voltage—30 volts. . .65 milliamperes
Normal plate voltage
750 volt
Normal plate voltage 750 to 1000 volts
Normal grid voltage
-30 volt
Normal grid voltage —30 to —60 volts
Output as unmodulated oscillator
50 watts
Output as unmodulated oscillator 50 watts
and should not exceed
10 volts
and should not exceed 10 volts, since an increase of 10% in the voltage may shorten the life by
Other
Maximum safe continuous dissipation by plate
65 watts
Maximum safe continuous dissipation by plate 65 watts
Maximum safe intermittent dissipation by plate
100 watts
Maximum safe intermittent dissipation by plate 100 watts