TBW1238

Transmitting power triode intended for RF amplification, oscillator, modulation, or industrial generator service. Manufacturer documentation emphasizes professional radio-frequency operation and substantial power handling.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 8 V / 130 A

Description

TBW1238 is a Philips water-cooled industrial RF-generator 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: 8 V
Nominal heater current: 130 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: 0.025 S
Amplification factor: 21
Max plate voltage: 13000 V
Max plate dissipation: 20000 W
Max cathode current: 5 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
8 V
DirectlyHeated
Filament current
130 A
DirectlyHeated
Amplification factor
21
Published
Transconductance
25000 µS
Published

Other

Maximum plate voltage
13000 V
Published limit
Maximum plate dissipation
20000 W
Published limit
Maximum plate/cathode current
5 A
Published limit
Maximum operating frequency
30 MHz
RFService
Maximum starting filament current
280 A
FilamentStarting
Maximum grid current
1.5 A
RFService
Plate voltage
12000 V
ClassC 30MHz
Plate current
4.5 A
ClassC 30MHz
Grid current
900 mA
ClassC 30MHz
Plate input power
54 kW
ClassC 30MHz
Plate dissipation
15 kW
ClassC 30MHz
Power output
39 kW
ClassC 30MHz

Capacitance

Grid-to-plate capacitance
23.5 pF
Published

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater/filament voltage
8 V
Heater/filament current
130 A
Transconductance
22000 uS
Amplification factor
21

Other

Maximum plate voltage
12000 V
Maximum plate dissipation
20000 W
Maximum cathode current
4.8 A
Operating plate voltage
12000 V
IndustrialClassC;30MHz
Operating plate current
3.2 A
IndustrialClassC;30MHz
Output power
39000 W
IndustrialClassC;30MHz

Capacitance

Plate/anode capacitance
0.9 pF
Grid capacitance
45 pF
Plate-grid capacitance
23.5 pF