TBL78000

Forced-air-cooled high-power Philips transmitting triode for industrial RF generators and transmitters. Rated for approximately 6 kW plate dissipation and 7.2 kV plate voltage for substantial radio-frequency power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.6 V / 33 A

Description

TBL78000 is a Philips forced-air-cooled high-power transmitting triode for industrial RF generators and transmitters. 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: 12.6 V
Nominal heater current: 33 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: 0.015 S
Amplification factor: 32
Max plate voltage: 7200 V
Max plate dissipation: 6000 W
Max cathode current: 2.2 A

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
12.6 V
DirectlyHeated
Filament current
33 A
DirectlyHeated
Amplification factor
32
Published
Transconductance
15000 µS
Published

Other

Maximum plate voltage
7200 V
Published limit
Maximum plate dissipation
6000 W
Published limit
Maximum plate/cathode current
2.2 A
Published limit
Maximum operating frequency
50 MHz
RFService
Plate voltage
6500 V
30 MHz
Plate current
2 A
30 MHz
Plate input power
13 kW
30 MHz
Plate dissipation
3.5 kW
30 MHz
Power output
9.5 kW
30 MHz

Capacitance

Plate-to-cathode capacitance
0.3 pF
Published
Grid capacitance
16 pF
Published
Grid-to-plate capacitance
11 pF
Published

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Anode voltage
6000 V
Anode current
1 A
Transconductance
15000 µS
Amplification factor
32
Anode capacitance
0.3 pF
Grid capacitance
16 pF
Anode-grid capacitance
11 pF
Maximum anode voltage
13000 V