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6973

Beam-power tube designed as a power amplifier in compact high-fidelity audio equipment, providing substantial output from a relatively small envelope.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9EU
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 450 mA

Description

Beam power tube used as a power amplifier in compact high-fidelity audio equipment.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9EU
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9EU - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	—	G2 — Screen Grid Original chart label: G2; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN3Base Pin	—	G1 — Control Grid Original chart label: G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN4Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN5Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN6Base Pin	—	G1 — Control Grid Original chart label: G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN7Base Pin	—	G3 — Suppressor GridGroup 9EU7 Original chart label: G3; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN7Base Pin	—	K — CathodeGroup 9EU7 Original chart label: K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN8Base Pin	—	G2 — Screen Grid Original chart label: G2; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU
PIN9Base Pin	—	P — Plate (Anode) Original chart label: P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EU

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 35000 Ω
Transconductance: 0.011 S
Max plate voltage: 440 V
Max screen voltage: 330 V
Max plate dissipation: 12 W
Max screen dissipation: 2.5 W
Max cathode current: 100 mA

High-fidelity beam-power output section.

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

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current
450 mA
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Grid voltage
-15 V
ClassA
Plate current
72 mA
ClassA
Load resistance
2500 ohm
ClassA
Power output
6.5 W
ClassA
Plate-to-plate load resistance
6600 ohm
ClassAB1;PushPull
Power output
24 W
ClassAB1;PushPull

Characteristic

Transconductance
11000 uS
ClassA

Capacitance

Grid-to-plate capacitance
0.7 pF
Input capacitance
8 pF
Output capacitance
8.5 pF

Data set 02

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current
450 mA
Heater voltage
6.3 V
Heater current
450 mA
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Grid voltage
-15 V
ClassA
Plate current
72 mA
ClassA
Load resistance
2500 ohm
ClassA
Power output
6.5 W
ClassA
Plate-to-plate load resistance
6600 ohm
ClassAB1;PushPull
Power output
24 W
ClassAB1;PushPull

Characteristic

Transconductance
11000 uS
ClassA

Capacitance

Grid-to-plate capacitance
0.7 pF
Input capacitance
8 pF
Output capacitance
8.5 pF

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

Grid-No.l to Plate
0.4 pF
Capacitance
Grid No.l to Cathode, Heater, Grid No.2, and Grid No.3
9 pF
Capacitance

Characteristic

Plate Voltage
250 V
Characteristics
Grid-No.l (Control-Grid) Voltage
-15 V
Characteristics
Plate Resistance (Approx.)
73000 ohm
Characteristics
Transconductance
4800 uS
Characteristics
Plate Current
46 mA
Characteristics
Grid-No.2 Current
3.5 mA
Characteristics
Grid-No.l Voltage (Approx.) for plate current of 100 jiA
-40 V
Characteristics

Other

Plate Voltage
440 V
MaximumRatings
Grid-No.2 Voltage
380 V
MaximumRatings
Plate Dissipation
12 W
MaximumRatings
Grid-No.2 Input
2 W
MaximumRatings
Grid-No.l Voltage
-15 V
TypicalOperation;PublishedValue1
Grid-No.l Voltage
-22 V
TypicalOperation;PublishedValue2
Grid-No.l Voltage
-25 V
TypicalOperation;PublishedValue3
Cathode-Bias Resistor
230 ohm
TypicalOperation;PublishedValue1
Cathode-Bias Resistor
270 ohm
TypicalOperation;PublishedValue2
Grid-No.l Voltage
30 V
TypicalOperation;PublishedValue1
Grid-No.l Voltage
44 V
TypicalOperation;PublishedValue2
Grid-No.l Voltage
50 V
TypicalOperation;PublishedValue3
Grid-No.l Voltage
48 V
TypicalOperation;PublishedValue4
Grid-No.l Voltage
55 V
TypicalOperation;PublishedValue5
Zero-Signal Plate Current
92 mA
TypicalOperation;PublishedValue1
Zero-Signal Plate Current
58 mA
TypicalOperation;PublishedValue2
Zero-Signal Plate Current
50 mA
TypicalOperation;PublishedValue3
Zero-Signal Plate Current
80 mA
TypicalOperation;PublishedValue4
Zero-Signal Plate Current
77 mA
TypicalOperation;PublishedValue5
Maximum-Signal Plate Current
105 mA
TypicalOperation;PublishedValue1
Maximum-Signal Plate Current
106 mA
TypicalOperation;PublishedValue2
Maximum-Signal Plate Current
107 mA
TypicalOperation;PublishedValue3
Maximum-Signal Plate Current
96 mA
TypicalOperation;PublishedValue4
Maximum-Signal Plate Current
92 mA
TypicalOperation;PublishedValue5
Zero-Signal Grid-No.2 Current ....
3.5 mA
TypicalOperation;PublishedValue1
Zero-Signal Grid-No.2 Current ....
2.5 mA
TypicalOperation;PublishedValue2
Zero-Signal Grid-No.2 Current ....
6 mA
TypicalOperation;PublishedValue3
Zero-Signal Grid-No.2 Current ....
5 mA
TypicalOperation;PublishedValue4
Maximum-Signal Grid-No.2 Current
16 mA
TypicalOperation;PublishedValue1
Maximum-Signal Grid-No.2 Current
14 mA
TypicalOperation;PublishedValue2
Maximum-Signal Grid-No.2 Current
13.7 mA
TypicalOperation;PublishedValue3
Maximum-Signal Grid-No.2 Current
14 mA
TypicalOperation;PublishedValue4
Maximum-Signal Grid-No.2 Current
14 mA
TypicalOperation;PublishedValue5
(Plate-to-plate)
8000 ohm
TypicalOperation;PublishedValue1
(Plate-to-plate)
7500 ohm
TypicalOperation;PublishedValue2
(Plate-to-plate)
8000 ohm
TypicalOperation;PublishedValue3
(Plate-to-plate)
5500 ohm
TypicalOperation;PublishedValue4
(Plate-to-plate)
6000 ohm
TypicalOperation;PublishedValue5
Total Harmonic Distortion
2 %
TypicalOperation;PublishedValue1
Total Harmonic Distortion
1.5 %
TypicalOperation;PublishedValue2
Total Harmonic Distortion
2 %
TypicalOperation;PublishedValue3
Total Harmonic Distortion
2 %
TypicalOperation;PublishedValue4
Total Harmonic Distortion
4 %
TypicalOperation;PublishedValue5
For fixed-bias operation
0.5 megohm
MaximumCircuitValues
For cathode-bias operation
1 megohm
MaximumCircuitValues
Grid-No.2 Input
1.75 W
MaximumRatings
Plate Supply Voltage
375 V
TypicalOperation;PublishedValue1
Plate Supply Voltage
370 V
TypicalOperation;PublishedValue2
Grid-No.l Voltage'
-33.5 V
TypicalOperation
Zero-Signal Cathode Current
62 mA
TypicalOperation;PublishedValue1
Zero-Signal Cathode Current
74 mA
TypicalOperation;PublishedValue2
Maximum-Signal Cathode Current
95 mA
TypicalOperation;PublishedValue1
Maximum-Signal Cathode Current
84 mA
TypicalOperation;PublishedValue2
Effective Load Resistance (Plate-to-plate)
12500 ohm
TypicalOperation;PublishedValue1
Effective Load Resistance (Plate-to-plate)
13000 ohm
TypicalOperation;PublishedValue2
Total Harmonic Distortion
1.5 %
TypicalOperation;PublishedValue1
Total Harmonic Distortion
1.2 %
TypicalOperation;PublishedValue2
Maximum-Signal Power Output
18.5 W
TypicalOperation;PublishedValue1
Maximum-Signal Power Output
15 W
TypicalOperation;PublishedValue2
For fixed-bias operation
0.1 megohm
MaximumCircuitValues
For cathode-bias operation
1 megohm
MaximumCircuitValues