TB2500

Directly heated Philips transmitting triode with thoriated-tungsten filament for RF and AF power service. Rated for approximately 300 W plate dissipation and 2 kV plate voltage, with moderate gain for professional power stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12 V / 7.3 A

Description

TB2500 is a Philips thoriated-tungsten transmitting triode. The supplied datasheet provides direct-filament data, RF/AF ratings, capacitances and high-power operating conditions.

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: 12 V
Nominal heater current: 7.3 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: 0.0075 S
Amplification factor: 32
Max plate voltage: 2000 V
Max plate dissipation: 300 W
Max cathode current: 600 mA

Published filament, capacitance, typical characteristics, limiting values and RF/AF operating tables reviewed.

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

Characteristic

Filament voltage
12 V
DirectlyHeated
Filament current
7.3 A
DirectlyHeated
Amplification factor
32
Published
Transconductance
7500 µS
Published

Other

Maximum plate voltage
2000 V
Published limit
Maximum plate dissipation
300 W
Published limit
Maximum cathode/plate current
600 mA
Published limit

Capacitance

Plate capacitance
6 pF
Published
Grid capacitance
12.5 pF
Published
Grid-to-plate capacitance
6 pF
Published

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Capacitances Ca
6 a
Capacitances Ca = 6
Capacités Cg
12.5 a
Capacités Cg = 12,5 pF