4W300B

Water-cooled transmitting tetrode for VHF/UHF RF amplification to approximately 500 MHz with about 300 W plate dissipation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 2.6 A

Description

4W300B is a Tetrode device in the supplied Amperex literature. Water-cooled external-anode tetrode; source describes it as electrically identical to the 4X250B family with greater reserve anode dissipation.

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: 6 V
Nominal heater current: 2.6 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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.012 S
Amplification factor: 5
Max plate voltage: 2000 V
Max screen voltage: 400 V
Max plate dissipation: 300 W
Max screen dissipation: 12 W
Max grid dissipation: 2 W

Water-cooled external-anode tetrode; source describes it as electrically identical to the 4X250B family with greater reserve anode dissipation.

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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Plate voltage
2000 V
RFAmplifier
RF output power
290 W
RFAmplifier
Maximum frequency at full input rating
500 MHz

Capacitance

Grid-to-plate capacitance
0.06 pF
Grid-to-filament/cathode capacitance
17.2 pF
Plate-to-filament/cathode capacitance
5 pF