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Tube Substitutions for:

EL34

Beam Power Audio Amplifier

Type

Substitutes

Base Diagram

EL34

6CA7, 6CA7

Notes:

Sylvania Type EL34

BEAM POWER AMPLIFIER

MECHANICAL DATA

Bulb

Special, straight

Base

Metal Octal 8-Pin

Basing

8ET

Cathode

Coated Unipotential

Mounting Position

Vertical preferred.

ELECTRICAL DATA

FILAMENT CHARACTERISTICS

Filament Voltage (AC)

6.3

Volts

Filament Current

1.5

Amps

DIRECT INTERELECTRODE CAPACITIES

Grid No. 1 to Plate

1.0

µµf

Input

15.5

µµf

Output

7.2

µµf

MAXIMUM RATINGS

Triode Operation Connected

Plate Voltage

500

Volts

Plate Dissipation

30

Watts

Grid No. 1 Cathode Bias Resistance

0.71

Megohm

Pentode Connected

Plate Voltage

800

Volts

Grid No. 2 Voltage

425

Volts

Plate Dissipation

25

Watts

Grid No. 2 Dissipation

8.0

Watts

Cathode Current

150

Ma

Grid No. 1 Cathode Bias Resistance

0.72

Megohm

CHARACTERISTICS AND TYPICAL OPERATION

Triode Operation Push-Pull

Plate Voltage

400

Volts

Cathode Resistor

220

Ohms

Zero Signal Plate Current

130

Ma

Max. Signal Plate Current

142

Ma

Load Resistance

5000

Ohms

Power Output

16.5

Watts

Total Harmonic Distortion

3

Percent

Pentode Operation Single Tube

Plate Voltage

265

300

Volts

Grid No. 2 Voltage

250

300

Volts

Cathode Resistor

190

Ohms

Grid No. 1 Voltage

-13.5

Volts

Zero Signal Plate Current

100

83

Ma

Transconductance

11000

11000

µmhos

Plate Resistance

2000

3500

Ohms

Power Output

11

11

Watts

Total Harmonic Distortion

10

10

Percent

Class AB1 Push-pull (Pentode Operation)

Plate Voltage

375

450

400

Volts

Grid No. 2 Voltage

375

450

400

Volts

Grid NO. 2 Resistor

470

1000

800

Ohms

Grid No. 1 Voltage

-36

Volts

Cathode Resistor

130

232

Ohms

A-F Grid Voltage (RMS)

20

27

25

Volts

Zero Signal Plate Current

150

120

60

Ma

Max. Signal Plate Current

188

143

221

Ma

Zero Signal Grid No. 2 Current

25

20

9

Ma

Max. Signal Grid NO. 2 Current

39

44

46

Ma

Load Resistance (P to P)

3500

6500

3500

Ohms

Power Output

35

40

54

Watts

Total Harmonic Distortion

1.7

5.1

1.6

Percent

Class AB1 Push-pull (Ultra-Linear
Operation)

Plate Voltage

430

430

Volts

Cathode Resistor

235

235

Ohms

A-F Grid Voltage (RMS)

17.5

25

Volts

Zero Signal Plate Current

125

125

Ma

Max. Signal Plate Current

130

140

Ma

Zero Signal Grid No. 2 Current

20

20

Ma

Max. Signal Grid NO. 2 Current

20.4

28

Ma

Load Resistance (P to P)

6000

6000

Ohms

Power Output

20

34

Watts

Total Harmonic Distortion

0.35

2.5

Percent

NOTES:

1

The maximum permissible limit for Grid No. 1 Resistor in
a Class B Circuit is 0.5 Megohms.

2

Grid No. 2 at 43% of Primary Winding.

APPLICATION

Type EL34 is a beam power audio amplifier capable of producing 100 watts of
output power. This typ has found extensive use in applications requiring
extremely high power outputs.

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