R148

Long-life dual triode with electrically similar sections designed for voltage-amplifier service, emphasizing extended operating life in professional electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 18 V / 200 mA

Description

Long-life dual triode with electrically similar sections for voltage-amplifier service.

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: 18 V
Nominal heater current: 200 mA
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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 11000 Ω
Transconductance: 0.0055 S
Amplification factor: 60
Max plate voltage: 250 V
Max plate dissipation: 2.5 W

Representative section row for identical repeated sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 11000 Ω
Transconductance: 0.0055 S
Amplification factor: 60
Max plate voltage: 250 V
Max plate dissipation: 2.5 W

Second physical triode section; added to align rows with SectionCount.

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

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
18 V
Nominal
HeaterCurrentNominal
200 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Plate Dissipation
2.5 W

Characteristic

Transconductance
5500 µS
Typical
Amplification Factor
60
Typical
Plate Resistance
11000 ohm
Typical