Data set 01
1937 Standard Valves
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
MaximumGridDissipation
12000 W
Published datasheet value
Characteristic
TotalEmission
75 A
Published datasheet value
Power - Triode (over 1000V 100W) ·Triode
4081A
Single-ended water-cooled triode documented by Standard Valves for high-power service, with construction, electrical constants, limiting conditions, and operating information.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 20 V / 59 A
Description
Single-ended water-cooled triode.
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
- 20 V
- Nominal heater current
- 59 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
- 6000 Ω
- Transconductance
- 0.0055 S
- Amplification factor
- 33
- Max plate voltage
- 17500 V
- Max plate dissipation
- 20000 W
- Max grid dissipation
- 12000 W
Published ratings and characteristics promoted from approved datasheet.
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
1946 Standard Telephone and Cables
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Grid-anode capacitance
18.6 pF
Published capacitance
Grid-filament capacitance
18.4 pF
Published capacitance
Anode-filament capacitance
3.8 pF
Published capacitance