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

25EH5

Beam-power pentode used in television-receiver audio-output stages, providing compact power amplification with heater characteristics suited to series-string equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CV
Socket code: B7G
Base pins: 7
Nominal heater: 25 V / 300 mA

Description

Power pentode used in the audio output stage of television 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.

Terminal	Section	Connection	Evidence
PIN1G3	A	G3 — Suppressor GridGroup 7CV1 EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CV
PIN1K	A	K — CathodeGroup 7CV1 EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CV
PIN2G1	A	G1 — 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
PIN5G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CV
PIN6G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CV
PIN7P	A	P — 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 0

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 11000 Ω
Transconductance: 0.0146 S
Max plate voltage: 150 V
Max screen voltage: 130 V
Max plate dissipation: 5.5 W
Max screen dissipation: 1.75 W

Reference/equivalence-only sparse-source exception: identical to 50EH5 except heater characteristics; electrical tables not reproduced.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

Heater voltage
25 V
Nominal
Heater current
300 mA
Nominal
Maximum grid 2 input
2 W
ClassA
Plate supply voltage
110 V
ClassA
Grid 2 supply voltage
115 V
ClassA
Cathode resistor
62 ohm
ClassA
Peak AF grid 1 voltage
3 V
ClassA
Load resistance
3000 ohm
ClassA
Total harmonic distortion
7 %
ClassA
Signal power output
1.4 W
ClassA
Plate supply voltage
140 V
ClassAB; PushPull; TwoTubes
Grid 2 supply voltage
120 V
ClassAB; PushPull; TwoTubes
Effective load resistance plate-to-plate
6000 ohm
ClassAB; PushPull; TwoTubes
Total harmonic distortion
5 %
ClassAB; PushPull; TwoTubes
Maximum-signal power output
3.8 W
ClassAB; PushPull; TwoTubes

Characteristic

Zero-signal plate current
42 mA
ClassA
Zero-signal grid 2 current
11.5 mA
ClassA
Transconductance
14600 uS
ClassA
Plate resistance
11000 ohm
ClassA

Capacitance

Grid 1 to plate
0.65 pF
Approximate
Grid 1 to cathode/grid3/heater/grid2
17 pF
Approximate
Plate to cathode/grid3/heater/grid2
9 pF
Approximate

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Characteristics

Heater Voltage
25 V
Heater Current
300 mA
Plate Resistance
11000 ohm
Transconductance
14600 uS

Other

Plate Voltage
110 V
ClassA
Screen Voltage
115 V
ClassA
Cathode Bias Resistor
62 ohm
ClassA
Peak AF Grid1 Voltage
3 V
ClassA
Zero-Signal Plate Current
42 mA
ClassA
Zero-Signal Screen Current
11.5 mA
ClassA
Load Resistance
3000 ohm
ClassA
Power Output
1.4 W
ClassA
Total Harmonic Distortion
7 percent
ClassA

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Characteristic

Grid 1-to-plate capacitance
0.65 pF
WholeTube
Input capacitance
17 pF
WholeTube
Output capacitance
9 pF
WholeTube

Other

Maximum plate voltage
150 V
WholeTube
Maximum screen voltage
130 V
WholeTube
Maximum plate dissipation
5.5 W
WholeTube
Maximum screen input
2 W
WholeTube
Transconductance
14600 µS
ClassA1
Plate resistance
11000 ohm
ClassA1
Load resistance
3000 ohm
ClassA1
Power output
1.4 W
ClassA1
Push-pull power output
3.8 W
PushPull ClassAB1 TwoTubes

Data set 04

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

Maximum Plate Voltage
150 V
Maximum Screen Voltage
130 V
Plate Dissipation
5 W
Screen Input
1.75 W

Characteristics

Plate Resistance
14000 Ω
Transconductance
12000 µS

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

Heater-Cathode Voltage
1.2 A
Other;PublishedValue1
Heater-Cathode Voltage
300 mA
Other;PublishedValue2
Heater-Cathode Voltage
150 mA
Other;PublishedValue3
Peak value
200 V
Other;PublishedValue1
Peak value
200 V
Other;PublishedValue2
Peak value
200 V
Other;PublishedValue3
Average value
100 V
Other;PublishedValue1
Average value
100 V
Other;PublishedValue2
Average value
100 V
Other;PublishedValue3
Plate Voltage
150 V
MaximumRating
Grid-No
2 V
MaximumRating;PublishedValue1
Grid-No
130 V
MaximumRating;PublishedValue2
Plate Dissipation
5.5 W
MaximumRating
Grid-No
2 W
MaximumRating;PublishedValue1
Grid-No
2 W
MaximumRating;PublishedValue2
Plate Supply Voltage
110 V
TypicalOperation
Grid-No
2 V
TypicalOperation;PublishedValue1
Grid-No
115 V
TypicalOperation;PublishedValue2
Cathode-Bias Resistor
62 ohm
TypicalOperation
Peak AF Grid-No
1 V
TypicalOperation
Zero-Signal Plate Current
42 mA
TypicalOperation
Maximum-Signal Plate Current
42 mA
TypicalOperation
Zero-Signal Grid-No
2 mA
TypicalOperation;PublishedValue1
Zero-Signal Grid-No
11.5 mA
TypicalOperation;PublishedValue2
Maximum-Signal Grid-No
2 mA
TypicalOperation;PublishedValue1
Maximum-Signal Grid-No
14.5 mA
TypicalOperation;PublishedValue2
Plate Resistance (Apnrox.)
11000 ohm
TypicalOperation
Transconductance
14600 uS
TypicalOperation
Load Resistance
3000 ohm
TypicalOperation
TotalHarmonic Distortion
7 %
TypicalOperation
Maximum-Signal Power Output
1.4 W
TypicalOperation
For fixed-bias operation
0.1 megohm
TypicalOperation
For cathode-bias operation
0.5 megohm
TypicalOperation
PJate Supply Voltage
140 V
TypicalOperation
Grid-No
2 V
TypicalOperation;PublishedValue1
Grid-No
120 V
TypicalOperation;PublishedValue2
Cathode-Bias Resistor
68 ohm
TypicalOperation
Peak AF Grid-No.l Voltage
9.4 V
TypicalOperation
Zero-Signal Plate Current
47 mA
TypicalOperation
Maximum-Signal Plate Current
51 mA
TypicalOperation

Capacitance

Grid No.l to Plate
0.65 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
17 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
9 pF
Capacitance;PublishedValue3