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Power - Tetrode (NOT beam) ·Tetrode-Tetrode

5894

High-frequency twin power tetrode for RF multiplier, amplifier, and modulator service, with transmitting ratings and forced-air or radiation cooling.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
SEPTAR7
Base pins
7
Nominal heater
12.6 V / 900 mA

Description

5894 is a Tetrode device. RF power tetrode with dual heater connection and CCS/ICAS ratings.

Socket description

Septar 7-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
SEPTAR7
Base pins
7
Nominal heater voltage
12.6 V
Nominal heater current
900 mA
Parallel heater voltage
6.3 V
Parallel heater current
1.8 A
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

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances
Amplification factor
8.2
Max plate voltage
600 V
Max screen voltage
250 V
Max plate dissipation
45 W

Representative electrical section; 2 physical sections are identical and compressed per locked repeated-section rule.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances
Amplification factor
8.2
Max plate voltage
600 V
Max screen voltage
250 V
Max plate dissipation
45 W

Identical second physical Tetrode section; duplicated from representative section per physical-section-row policy.

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

1956 RCA Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

  • HeaterOrFilamentVoltage

    12.6 V

  • HeaterOrFilamentCurrent

    900 mA

  • Heater Voltage Parallel

    6.3 V

    Parallel

  • Heater Current Parallel

    1.8 A

    Parallel

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Maximum plate dissipation CCS

    40 W

    CCS

  • Maximum plate dissipation ICAS

    45 W

    ICAS

  • Plate voltage

    600 V

    CCS ClassC

  • Plate current

    200 mA

    CCS ClassC

  • Power output

    85 W

    CCS ClassC

  • Grid voltage

    -80 V

    CCS ClassC

  • Grid current

    5 mA

    CCS ClassC

  • Screen voltage

    250 V

    CCS ClassC

  • Plate voltage

    750 V

    ICAS ClassC

  • Power output

    105 W

    ICAS ClassC

Characteristic

  • Maximum frequency

    250 MHz

  • Grid-to-plate capacitance

    0.08 pF

  • Input capacitance

    6.7 pF

  • Output capacitance

    2.1 pF

    PushPull

Data set 03

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Application

  • Application

    RF amplifier / oscillator / frequency multiplier

  • Modulator service

    Published

Construction

  • Internal neutralization

    Yes

Other

  • Class-C operation

    Published

    ClassC

Data set 04

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Heater voltage alternate

    6.3 V

    ParallelConnection

  • Heater current alternate

    1.8 A

    ParallelConnection

  • Plate voltage

    600 V

    CCS

  • Plate current

    200 mA

    CCS

  • RF output power

    85 W

    CCS

  • Grid voltage

    -80 V

    CCS

  • Grid current

    5 mA

    CCS

  • Screen voltage

    250 V

    CCS

  • Maximum frequency at full input rating

    200 MHz