ELECTRO-HARMONIX TUBE EF86EH Datasheet

Svetlana EF86

B

A

EF86

Made in Russia

Svetlana

C

5

7

8

1

2

3

4

internal
shield

C

6

P

H

9

H

internal
shield

suppressor
grid

control
grid

screen
grid

High-Performance Audio
Small-Signal Pentode

he Svetlana EF86 is a glass envelope miniature pentode intended for high-quality audio

T

preamplifier service. Close manufacturing specification tolerances and improved
processing provide improved reliability and superior sonic performance. The Svetlana EF86 is
manufactured in the Svetlana factory in Russia, and is designed to be a direct replacement for
any EF86 or 6267 type.

The Svetlana EF86 features:

• Low microphonics and low heater hum induction - suitable for input stages in high-gain
microphone preamps, phono preamps or as a gain stage in condenser microphones

• Electrostatic shield is built-in, covers entire inner structure—no external shield required

• Low distortion in pentode or triode connection

• Extended processing and aging for stability and reliability

• Comprehensive static and audio amplifier testing before and after aging

General Characteristics
Electrical

min. typ. max.
Heater Voltage (AC or DC) 5.7 6.3 6.9 V
Heater Current (typical) 0.2 A
Cathode: oxide-coated, unipotential
Cathode-to-heater potential

Mechanical

Operating position: Any
Base 9-pin miniature noval
Basing diagram JEDEC 9CQ
Socket Svetlana SK9A or equivalent
Cooling Radiation and convection
Envelope temperature (max) 200 C
Nominal dimensions:

Diameter 22 mm (0.867 in)
Base to top 46.5 mm (1.836 in)
Overall height 55.5 mm (2.180 in)
Net weight 13 gm

Maximum Ratings

DC plate voltage Vp 300 V
Screen grid voltage Vg2 200 V
Plate dissipation 1 W
Screen grid dissipation 0.2 W
Cathode current 6.0 mA

±

100 V

Svetlana EF86 Outline drawing

Dimensional Data

Dim. Millimeters Inches

A 46.5 1.835
C 55.5 2.180
B 22 0.867

Svetlana

ELECTRON DEVICES

Base pin connections bottom view

SM

Headquarters:

8200 South Memorial Parkway
Huntsville, AL 35802
USA
Phone: [phone]
Fax: [phone]

www.svetlana.com

Marketing & Engineering:

3000 Alpine Road
Portola Valley, CA 94028
USA
Phone: [phone]
Fax: [phone]

10/96

PLATE VOLTAGE (VOLTS)

PLATE CURRENT (MILLIAMPERES)

7

6

5

4

3

2

1

0

0

Vg=-0.5v

200 400 600 800

Vscreen = 140V

Grid Voltage

Svetlana EF86
Typical Plate Charicteristics

-1.0

-1.5

-2.0

-2.5

-5.0

-4.0

-3.5

-3.0

Svetlana EF86

ELECTRON DEVICES

Svetlana

High-Performance Audio
Small-Signal Pentode

Typical operation, Class A Connection, Small-signal amplifier

pentode triode
DC plate Voltage 250 250 V
Screen grid voltage 140 V
Cathode bias resistor 1k 3.9k ohms
Zero-signal plate current 3 0.65 mA
Zero-signal screen grid current 0.6 mA
Plate resistance (approx) 2.5 megohms 65k ohms
Load resistance 220k 220k ohms
Total harmonic distortion 5 3.5 %
Maximum voltage output 50 39 vrms

Vg=0v

7

6

5

4

3

2

PLATE CURRENT (MILLIAMPERES)

1

0

0

-2.0

-4.0

200 400 600 800

PLATE VOLTAGE (VOLTS)

-6.0

-8.0

Svetlana EF86
Typical Plate Charicteristics

screen connected to plate

Grid Voltage

-10.0

-12.0

-14.0

-16.0