F895

Water-cooled Federal transmitting triode for RF amplification, oscillation, and Class B modulation. Rated around 40 kW plate dissipation and 17 kV, published Class-C telegraphy operation reaches approximately 100 kW output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 19 V / 138 A

Description

Federal F-895 high-power three-electrode transmitting tube for RF amplification, oscillator, and Class B modulator service. The water-cooled anode can dissipate 40 kW and the pure-tungsten filament is operated from three-phase AC.

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: 19 V
Nominal heater current: 138 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: 37
Max plate voltage: 17000 V
Max plate dissipation: 40000 W
Max cathode current: 62 A

Published ratings/characteristics semantically audited; condition-specific operating values preserved in parameter rows.

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 01

1962 ITT

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
37

Other

Maximum plate voltage
17000 V
Maximum plate dissipation
40000 W
Peak cathode current
9 A
Maximum/full-ratings frequency
25 MHz

Capacitance

Grid-plate capacitance
40 pF
Grid-filament capacitance
80 pF
Plate-filament capacitance
8 pF

Construction

Cooling method
Water

Data set 02

1962 ITT Industrial and Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Amplification factor
37
Peak cathode current
62 A

Other

Filament starting current
210 A
Maximum
Filament cold resistance
0.013 ohm
DC plate voltage
17000 V
ClassB Audio
Maximum signal DC plate current
9 A
ClassB Audio
Maximum signal plate input
100 kW
ClassB Audio
Plate dissipation
40 kW
ClassB Audio
DC plate voltage
17000 V
ClassC Telegraphy
DC grid voltage
-3000 V
ClassC Telegraphy
Plate input
140 kW
ClassC Telegraphy
Typical power output
100 kW
ClassC Telegraphy

Capacitance

Grid-plate capacitance
40 pF
Grid-filament capacitance
80 pF
Plate-filament capacitance
8 pF