Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
HeaterOrFilamentVoltage
27 V
HeaterOrFilamentCurrent
225 A
Power - Triode ·Triode
298B
Water-cooled high-power Western Electric transmitting-triode variant for substantial RF power service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 27 V / 225 A
Description
Water-cooled high-power transmitting triode variant.
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
- 27 V
- Nominal heater current
- 225 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
- Amplification factor
- 32
- Max plate voltage
- 20000 V
- Max plate dissipation
- 100000 W
Promoted fields populated from explicitly published ratings/characteristics; service-specific data retained as parameters.
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
1971 Machlette Laboratories
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
and [1]
11 A
and 11 amperes apply at frequencies up to 4 mc/sec; opera- are exhausted by a straight-line, high-voltage process assuring
and [2]
4 A
and 11 amperes apply at frequencies up to 4 mc/sec; opera- are exhausted by a straight-line, high-voltage process assuring
tion at
20 mA
tion at 20 mc/sec is permissible with plate voltage reduced the same high standards as characterize the Machlett line of
to
12 kV
to 12 kVdc. high- and super-voltage x-ray tubes.
Filament Voltage [1]
27
Filament Voltage ........................................... 27 27 vols
Filament Voltage [2]
27
Filament Voltage ........................................... 27 27 vols
Filament Current at [1]
27 V
Filament Current at 27 volts .................................. 225 225 amperes
Filament Current at [2]
225 V
Filament Current at 27 volts .................................. 225 225 amperes
Filament Current at [3]
225 V
Filament Current at 27 volts .................................. 225 225 amperes
Filament Starting Current [1]
340
Filament Starting Current 340 340 ampercs
Filament Starting Current [2]
340
Filament Starting Current 340 340 ampercs
Filament Cold Resistance [1]
96 ohm
Filament Cold Resistance ........... 0096 .0096 ohms
Filament Cold Resistance [2]
96 ohm
Filament Cold Resistance ........... 0096 .0096 ohms
Amplification Facror [1]
32
Amplification Facror ... 32 57.5
Amplification Facror [2]
57.5
Amplification Facror ... 32 57.5
Grid-Plate Transconductance [1]
22000 uS
Grid-Plate Transconductance 22000 20000 uMhos
Grid-Plate Transconductance [2]
20000 uS
Grid-Plate Transconductance 22000 20000 uMhos
Direct Plate Voltage ..o
20000 V
Direct Plate Voltage ..o . 20000 volts
Plate DissiPation . ... i
100000
Plate DissiPation . ... i 100000 wates