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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

50EH5

High-transconductance series-heater audio power pentode delivering about 1.4 W from a 110 V plate supply.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CV
Socket code: B7G
Base pins: 7
Nominal heater: 50 V / 150 mA

Description

Power pentode used in the audio output stage of television receivers. It is an explicit heater variant/co-designation in 25EH5.pdf.

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: 50 V
Nominal heater current: 150 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 1

Pentode

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: 2 W
Max cathode current: 50 mA

Maximum ratings and Class A characteristics promoted from the printed tables.

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 1

Pentode

Other

Heater voltage
50 V
Heater current
150 mA
Plate supply voltage
110 V
ClassA1
Screen supply voltage
115 V
ClassA1
Maximum signal power output
1.4 W
ClassA1
Maximum signal power output
3.8 W
PushPull;ClassAB1;TwoTubes

Capacitance

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

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical plate voltage
110 V
ClassA
Typical screen voltage
115 V
ClassA
Zero-signal screen current
11.5 mA
ClassA
Maximum-signal screen current
14.5 mA
ClassA
Power output
1.4 W
ClassA

Characteristics

Transconductance
14600 uS

Application

Application
Audio output amplifier

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical plate voltage
110 V
ClassA
Typical screen voltage
115 V
ClassA
Zero-signal plate current
42 mA
ClassA
Load resistance
3000 ohm
ClassA
Maximum-signal power output
1.4 W
ClassA
Maximum plate voltage
150 V
PromotedValue
Maximum screen voltage
130 V
PromotedValue
Maximum plate dissipation
5.5 W
PromotedValue
Maximum screen dissipation
2 W
PromotedValue
Plate Voltage -►
150 V
PublishedTable
Grid 2 (Screen-Grid) Voltage ~
130 V
PublishedTable
Plate Dissipation ~
5.5 W
PublishedTable
Grid 2 Input -►
2 W
PublishedTable
For Fixed-Bias Operation
0.1 Mohm
PublishedTable
For Cathode-Bias Operation
0.5 Mohm
PublishedTable
Plate Supply Voltage
110 V
PublishedTable
Grid 2 Supply Voltage
115 V
PublishedTable
Cathode Resistor
62 ohm
PublishedTable
Peak Af Grid 1 Voltage
3 V
PublishedTable
Signal Plate Current (Max.)
42 mA
PublishedTable
Zero-Signal Grid 2 Current
11.5 mA
PublishedTable

Characteristics

Plate resistance
11000 ohm
PromotedValue
Transconductance
0.0146 A/V
PromotedValue
Grid 1 To Plate
0.65 pF
PublishedTable
Grid 1 To Cathode &Grid 3, Heater &Grid 2
17 pF
PublishedTable
Plate To Cathode &Grid 3, Heater &Grid 2
9 pF
PublishedTable
Average Characteristics 50 Volts
150 mA
PublishedTable
Current Operation 150 *
70 mA
PublishedTable
Heater Negative With Respect To Cathode
200 V
PublishedTable

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
110 V
ClassA
Screen Voltage
115 V
ClassA
Plate Current
42 mA
ClassA
Screen Current
11.5 mA
ClassA
Load Resistance
3000 ohm
ClassA
Power Output
1.4 W
ClassA
Total Harmonic Distortion
7 %
ClassA

Data set 05

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
50 V
Heater current
150 mA
Plate voltage
110 V
ClassA
Screen voltage
115 V
ClassA
Cathode resistor
62 ohm
ClassA
Plate current
36 mA
ClassA
Screen current
10 mA
ClassA
Maximum plate voltage
150 V
Maximum screen voltage
130 V
Plate dissipation
5.5 W
Screen input
2 W

Characteristic

Plate resistance
17500 ohm
ClassA
Transconductance
13500 uS
ClassA

Capacitance

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

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

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

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