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Power - Pentode (NOT beam) ·Pentode

2L33

Power pentode designed for both audio/output amplification and radio-frequency power-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
1.2 V / 120 mA

Description

Directly heated pentode for Class A output service and Class C high-frequency power amplification, with series or parallel filament operation.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
1.2 V
Nominal heater current
120 mA
Parallel heater voltage
1.2 V
Parallel heater current
120 mA
Series capable
Yes

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

Pentode

X-ray radiationInterelectrode capacitances
Max plate voltage
150 V
Max screen voltage
135 V
Max screen dissipation
0.9 W
Max cathode current
25 mA

Published ratings and characteristics promoted from the source where directly stated.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater or filament voltage

    1.2 V

    Published nominal value

  • Heater or filament current

    120 mA

    Published nominal value

  • Series heater voltage

    2.4 V

    Series filament connection

  • Parallel heater voltage

    1.2 V

    Parallel filament connection