TBL2500

Forced-air-cooled ceramic coaxial UHF transmitting triode for high-frequency power service. Rated for approximately 500 W plate dissipation and 2.7 kV plate voltage for substantial UHF oscillator and amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 3.2 V / 19 A

Description

TBL2500 is a Philips forced-air-cooled ceramic-envelope coaxial UHF transmitting triode. Its datasheet specifies direct-filament operation, RF power ratings, cooling requirements, capacitances and representative 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: 3.2 V
Nominal heater current: 19 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: 0.014 S
Amplification factor: 70
Max plate voltage: 2700 V
Max plate dissipation: 500 W
Max cathode current: 400 mA

Published filament data, capacitances, typical characteristics, limiting values and RF operating conditions 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
3.2 V
DirectlyHeated
Filament current
19 A
DirectlyHeated
Amplification factor
70
Published
Transconductance
14000 µS
Published

Other

Maximum plate voltage
2700 V
Published limit
Maximum plate dissipation
500 W
Published limit
Maximum plate/cathode current
400 mA
Published limit
Maximum operating frequency
940 MHz
RFService
Plate voltage
2400 V
UHF
Plate current
240 mA
UHF
Plate input power
1000 W
400 MHz
Plate dissipation
330 W
400 MHz

Capacitance

Plate-to-cathode capacitance
0.05 pF
Published
Grid capacitance
11 pF
Published
Grid-to-plate capacitance
3.8 pF
Published

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Anode voltage
2400 V
Anode current
240 mA
Transconductance
14000 µS
Amplification factor
70
Anode capacitance
0.05 pF
Grid capacitance
11 pF
Anode-grid capacitance
3.8 pF
Maximum anode voltage
2700 V
Maximum anode dissipation
500 W