Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage - Triode (single) ·Triode

A577

OSRAM triode valve for general electronic service. Available source material does not establish a narrower functional application confidently.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B5
Base pins
5
Nominal heater
4 V / 1 A

Description

A577: OSRAM triode valve. The complete approved OSRAM sheet was read for construction, characteristics, operating data, and application guidance.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B5
Base pins
5
Nominal heater voltage
4 V
Nominal heater current
1 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
3000 Ω
Transconductance
0.002 S
Amplification factor
6
Max plate voltage
250 V

Published characteristics promoted where reliably identified; additional source values retained below.

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

1937 Osram Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater/filament voltage

    4 V

  • Heater/filament current

    1 A

  • Plate impedance

    3000 ohm

  • Mutual conductance

    2000 uS

  • Amplification factor

    6

Other

  • Maximum anode voltage

    250 V

Data set 02

193X Osram

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Amplification factor

    6

  • Mutual conductance

    2000 uS