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Power - Beam Single (NOT sweep) (under 10W) ·BeamPower

25C5

Beam-power tube designed for the audio-output stage of compact AC/DC radio receivers, delivering roughly two to 2.5 watts in Class-A service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7CV
Socket code
B7G
Base pins
7
Nominal heater
25 V / 300 mA

Description

Beam power tube for the audio output stage of compact AC/DC radio receivers.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7CV
Socket code
B7G
Base pins
7
Nominal heater voltage
25 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7CV - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G3AG3 — Suppressor GridGroup 7CV1

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN1KAK — CathodeGroup 7CV1

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN2G1AG1 — Control Grid

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN3H—H — Heater

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN4H—H — Heater

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN5G1AG1 — Control Grid

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN6G2AG2 — Screen Grid

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

PIN7PAP — Plate (Anode)

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CV

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
10000 Ω
Transconductance
0.0075 S
Max plate voltage
135 V
Max screen voltage
117 V
Max plate dissipation
5.5 W
Max screen dissipation
1.25 W

Shared family ratings and Class A characteristics promoted; heater-specific differences remain at tube level.

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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • RCA

    1.25 W

    RCA-25C5 is a beam power tube of the 7-pin GRID-NO.2 INPUT. + v v + v « .« 1.25 max. watts

  • to cathode

    200 V

    to cathode . . . . 200* max. volts

  • amplifier service, a single

    25

    amplifier service, a single 25C5 operated with a

  • Flate voltage

    120 V

    Flate voltage. . . . . . . . . . . .. 120 volts

  • plate voltage of

    2 V

    plate voltage of 120 volts, and a grid-No.2

  • Grid-No

    110 V

    Grid-No.2 voltage. . . . . . . . . . . 110 volts

  • voltage of

    -8 V

    voltage of 110 voits, can deliver a maximum sig- Grid-No.1 voltage. . . . . . . . . . . -8 volts

  • nal power output of

    8 W

    nal power output of 2.3 watts. Peak AF Grid-No.1 voltage. . . . . . . 8 volts

  • Zero-sSignal Plate Current

    49 mA

    Zero-sSignal Plate Current. . . . . . . 49 ma

  • GENERAL DATA Max.—Signal Plate Current

    50 mA

    GENERAL DATA Max.—Signal Plate Current. . . . . . . 50 ma

  • Zero-Signal Grid-No

    2 mA

    Zero-Signal Grid-No.2 current. . . . . y ma

  • Max.-Signal Grid-No

    8.5 mA

    Max.-Signal Grid-No.2 Current. P 8.5 ma

  • Max.-Signal Power Output

    2.3 W

    Max.-Signal Power Output . . . . . . . 2.3 watts

  • heater, and grid No

    13

    heater, and grid No.2. . . + . . . 13 puuf

Characteristic

  • Heater, for Unipotential cCathode: Plate Resistance (Approx.)

    10000 ohm

    Heater, for Unipotential cCathode: Plate Resistance (Approx.) . . . . . . 10000 ohms

  • voltage (AC or DC} .« + « « v v «

    7500 V

    voltage (AC or DC} .« + « « v v « . . 25 volts Transconductance . . . . . . . . . . 7500 umhos

  • Current. . . . . e e e

    2500 A

    Current. . . . . e e e 0.3 amp Load Resistance. . . . . e 2500 ohms

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    25 V

    Nominal

  • Heater current

    300 mA

    Nominal

  • Plate voltage

    120 V

    ClassA

  • Screen voltage

    110 V

    ClassA

  • Grid 1 voltage

    -8 V

    ClassA

  • Load resistance

    2500 ohm

    ClassA

  • Total harmonic distortion

    10 %

    ClassA

  • Maximum-signal power output

    2.3 W

    ClassA

Characteristic

  • Zero-signal plate current

    49 mA

    ClassA

  • Plate resistance

    10000 ohm

    ClassA

  • Transconductance

    7500 uS

    ClassA

Capacitance

  • Grid 1 to plate

    0.6 pF

    Direct interelectrode capacitance

  • Input capacitance

    13 pF

    Direct interelectrode capacitance

  • Output capacitance

    8.5 pF

    Direct interelectrode capacitance

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Plate voltage

    120 V

    ClassA

  • Plate current

    49 mA

    ClassA

Characteristics

  • Plate resistance

    10000 Ohm

  • Transconductance

    7500 uS

Data set 04

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

  • Heater Voltage

    25 V

  • Heater Current

    300 mA

  • Grid-Plate Capacitance

    0.6 pF

  • Input Capacitance

    13 pF

  • Output Capacitance

    8.5 pF

  • Plate Resistance

    10000 ohm

  • Transconductance

    7500 uS

Other

  • Maximum Plate Voltage

    135 V

  • Maximum Screen Voltage

    117 V

  • Maximum Plate Dissipation

    6 W

  • Maximum Screen Dissipation

    1.25 W

  • Plate Voltage

    120 V

    ClassA

  • Screen Voltage

    110 V

    ClassA

  • Grid Voltage

    -8 V

    ClassA

  • Load Resistance

    2500 ohm

    ClassA

  • Power Output

    2.3 W

    ClassA

  • Total Harmonic Distortion

    10 percent

    ClassA

Data set 05

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Plate voltage

    110 V

    ClassA

  • Grid #2 voltage

    110 V

    ClassA

  • Peak AF grid #1 voltage

    8 V

    ClassA

  • Zero-signal plate current

    43 mA

    ClassA

  • Zero-signal grid #2 current

    4 mA

    ClassA

  • Maximum-signal power output

    2.5 W

    ClassA

Characteristic

  • Plate resistance

    10000 ohm

    ClassA

  • Transconductance

    5500 uS

    ClassA

Capacitance

  • Grid-to-plate capacitance

    0.6 pF

  • Output capacitance

    8.5 pF

Data set 06

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Plate Voltage

    110 V

    ClassA

  • Screen Voltage

    110 V

    ClassA

  • Plate Current

    49 mA

    ClassA

  • Screen Current

    4 mA

    ClassA

  • Load Resistance

    2500 ohm

    ClassA

  • Power Output

    1.9 W

    ClassA

  • Total Harmonic Distortion

    9 %

    ClassA

Data set 07

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

  • Heater voltage

    25 V

    Nominal heater rating from supplied sheet

  • Heater current

    300 mA

    Nominal heater rating from supplied sheet

  • Voltage

    25

    Published 25C5 datasheet value

  • Current

    0.3

    Published 25C5 datasheet value

  • Plate Voltage

    120

    Published 25C5 datasheet value

  • Grid-No.2 Voltage

    110

    Published 25C5 datasheet value

  • Grid-No.l Voltage

    -8

    Published 25C5 datasheet value

Other

  • PLATE VOLTAGE

    135

    Published 25C5 datasheet value

  • GRID-No.2 (SCREEN-GRID) VOLTAGE

    117

    Published 25C5 datasheet value

  • PLATE DISSIPATION

    6

    Published 25C5 datasheet value

  • Maximum plate voltage

    135 V

    PublishedOnSupplied25C5

  • Maximum screen-grid voltage

    117 V

    PublishedOnSupplied25C5

  • Maximum plate dissipation

    6 W

    PublishedOnSupplied25C5

  • Maximum screen-grid dissipation

    1.25 W

    PublishedOnSupplied25C5

Data set 08

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Peak value

    200 V

    MaximumRating;PublishedValue1

  • Peak value

    200 V

    MaximumRating;PublishedValue2

  • Average value

    100 V

    MaximumRating;PublishedValue1

  • Average value

    100 V

    MaximumRating;PublishedValue2

  • Plate Voltage

    150 V

    MaximumRating

  • Grid-No

    2 V

    MaximumRating;PublishedValue1

  • Grid-No

    130 V

    MaximumRating;PublishedValue2

  • Grid-No

    1 V

    MaximumRating;PublishedValue1

  • Grid-No

    0 V

    MaximumRating;PublishedValue2

  • Plate Dissipation

    7 W

    MaximumRating

Capacitance

  • Grid No.] to Plate

    0.6 pF

    Capacitance

  • Grid No.l to Cathode, Heater. Grid No

    2 pF

    Capacitance;PublishedValue1

  • Grid No.l to Cathode, Heater. Grid No

    3 pF

    Capacitance;PublishedValue2

  • Grid No.l to Cathode, Heater. Grid No

    13 pF

    Capacitance;PublishedValue3

  • Plate to Cathode, Heater, Grid No

    2 pF

    Capacitance;PublishedValue1

  • Plate to Cathode, Heater, Grid No

    3 pF

    Capacitance;PublishedValue2

  • Plate to Cathode, Heater, Grid No

    8.5 pF

    Capacitance;PublishedValue3