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Tube Tinker — Electron Tube Database
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Power - Beam (NOT sweep) ·BeamPower

7561

Long-life audio-frequency power pentode designed for Class-A or push-pull Class-AB amplifier service.

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

Description

Long-life AF power pentode for Class-A or push-pull Class-AB amplifier service.

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
25 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

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
8000 Ω
Transconductance
0.01 S
Amplification factor
7.2
Max plate voltage
350 V
Max screen voltage
200 V
Max plate dissipation
13 W
Max screen dissipation
2 W
Max cathode current
150 mA

Published Telefunken/JEDEC ratings and characteristics promoted where applicable; additional values 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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Application

  • Application

    AF power output

Other

  • Class-A operation

    Published

    ClassA

  • Push-pull Class-AB operation

    Published

    PushPull,ClassAB