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R120

Low-mu La Radiotechnique audio power triode for single-ended and symmetrical Class A amplifier service. Low plate resistance, useful transconductance, and approximately 15 W plate dissipation support moderate high-quality audio output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 1.45 A

Description

Power-amplifier triode for single-ended and symmetrical Class-A 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: 6.3 V
Nominal heater current: 1.45 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

Plate resistance: 840 Ω
Transconductance: 0.0064 S
Amplification factor: 5.4
Max plate voltage: 300 V
Max plate dissipation: 15 W
Max cathode current: 90 mA

Triode section; promoted values are taken from the approved source where explicitly published.

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

Plate voltage
250 V
Triode
Plate current
60 mA
Triode
Output power
35 W
Triode
es Ve 23,5 V ett
23.5 V
Triode
Tension par anode
250 V
Triode
Plate current
0 mA
Triode
Output power
5 W
Triode
Input voltage
20 V
Triode
Plate voltage
300 V
Triode
Plate dissipation
15 W
Triode
Grid-circuit resistance
0.7 Mohm
Triode
Cathode current
90 mA
Triode
Tension entre tilament et cathode
50 V
Triode
Cathode-bias resistance
600 ohm
Triode
Plate resistance
840 ohm
Triode
Load impedance
2500 ohm
Triode
Cathode-bias resistance
300 ohm
Triode
Load impedance
5000 ohm
Triode

Capacitance

Input capacitance
18.5 pF
Triode