EBC91

Double-diode very-high-mu triode for receiver detection and resistance-coupled audio amplification. Two diode sections handle detector and control-voltage rectification while the triode provides substantial small-signal gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: B7G
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

High-gain audio-frequency voltage-amplifier triode combined with twin diodes.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 1 mA

Representative section for two diode systems sharing the common cathode.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second physical diode section added in approved reconciliation.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.00155 S
Amplification factor: 100
Max plate voltage: 330 V
Max plate dissipation: 0.5 W

Published ratings and characteristics promoted from the approved source.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Diode current maximum
1 mA

SECTION 3

Triode

Characteristics

Plate voltage
100 V
Va=100V
Grid voltage
-1 V
Va=100V
Plate current
0.5 mA
Va=100V
Amplification factor
100
Va=100V
Plate resistance
80000 ohm
Va=100V
Plate voltage
250 V
Va=250V
Grid voltage
-2 V
Va=250V
Plate current
1.2 mA
Va=250V
Amplification factor
100
Va=250V
Plate resistance
62500 ohm
Va=250V
Transconductance at 250 V
1.6 mA/V

Data set 02

1969 Tesla Manual of Electronic Tubes

Published operating points and test conditions from this source.

SECTION 3

Triode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value
Transconductance
1550 µS
Published operating characteristic

Other

Maximum plate dissipation
0.5 W
Published maximum rating
Application
AF resistance-coupled amplifier
Triode section