4CX250K

Compact forced-air-cooled external-anode radial-beam tetrode rated at 250 watts plate dissipation and designed especially for RF cavity operation.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

The 8245 is one of the Eimac 8245/4CX250K and 8246/4CX250M compact forced-air-cooled external-anode radial-beam tetrodes, rated at 250 W plate dissipation and designed especially for cavity operation.

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

Amplification factor: 5
Max plate voltage: 2000 V
Max screen voltage: 400 V
Max plate dissipation: 250 W
Max screen dissipation: 12 W
Max grid dissipation: 2 W

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 Eimac

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Frequency for Maximum Ratings CW
500 MHz
Frequency for Maximum Ratings Pulsed
1500 MHz

Capacitance

Input Capacitance
25-29 pF
GroundedCathode
Output Capacitance
4.2-6.2 pF
GroundedCathode
Feedback Capacitance
0.056 pF
GroundedCathode