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Voltage - Triode (single) ·Triode

L63

Indirectly heated general-purpose triode designed for conventional Class A voltage amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

Indirectly heated general-purpose triode for Class-A voltage amplification.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7700 Ω
Transconductance
0.0026 S
Amplification factor
20
Max plate voltage
250 V
Max plate dissipation
2.5 W

Promoted values mapped from printed rating/approximate-data tables; additional operating points and capacitances retained as parameters.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Grid-Cathode Capacitance

    3.7 pF

  • Anode-Cathode Capacitance

    2.9 pF

  • Grid-Anode Capacitance

    4.2 pF

  • Typical Anode Voltage

    250 V

  • Typical Grid Bias

    -1.9 V

  • Voltage Gain

    16 ratio