MA4500

Low-mu Philips power triode for high-voltage modulator and low-frequency amplifier service. Published operation provides about 152 W Class A or approximately 950 W from a two-tube Class B modulator.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 17 V / 9.6 A

Description

MA4500 is a Triode device in the supplied Philips industrial literature. Directly heated high-power triode for modulator and low-frequency amplifier service.

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: 17 V
Nominal heater current: 9.6 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0015 S
Amplification factor: 7.5
Max plate voltage: 4000 V
Max plate dissipation: 500 W
Max grid dissipation: 50 W
Max cathode current: 600 mA

Directly heated high-power triode for modulator and low-frequency amplifier service.

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 Philips Electron Tubes Handbook V4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Anode capacitance
1.2 pF
Grid capacitance
11.3 pF
Anode-grid capacitance
12 pF

Characteristic

Amplification factor
7.5
Transconductance at 175mA
1500 uS
Saturation current
600 mA

Other

Plate voltage
4000 V
ClassA; Modulator
Power output
152 W
ClassA; Modulator
Plate voltage
4000 V
ClassB; Modulator; TwoTubes
Power output
950 W
ClassB; Modulator; TwoTubes
Maximum grid dissipation
50 W
Maximum grid resistance
50 kOhm