TBL1238

Directly heated Philips industrial RF-generator power triode for high-power oscillator and amplifier service. Rated for approximately 20 kW plate dissipation and 13 kV plate voltage for substantial radio-frequency power generation.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

TBL1238 is a Philips industrial RF-generator 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: 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: 0.022 S
Amplification factor: 21
Max plate voltage: 13000 V
Max plate dissipation: 20000 W
Max cathode current: 5 A

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
8 V
DirectlyHeated
Filament current
130 A
DirectlyHeated

Other

Maximum plate voltage
13000 V
Published limit
Maximum plate dissipation
20000 W
Published limit
Maximum cathode/plate current
5 A
Published limit
Maximum starting filament current
280 A
FilamentStarting
Maximum plate input power
60 kW
RFService
Maximum grid current
1.5 A
RFService
Plate voltage
12000 V
ClassC Industrial
Plate current
4.5 A
ClassC Industrial

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Anode voltage
12000 V
Anode current
2 A
Transconductance
22000 µS
Amplification factor
21
Anode capacitance
0.9 pF
Grid capacitance
45 pF
Anode-grid capacitance
23.5 pF
Maximum anode voltage
13000 V
Maximum anode dissipation
15000 W