EBC33

Double-diode high-mu triode for receiver detector, AVC, and audio voltage-amplifier service. Paired diodes perform signal and control rectification while the high-gain triode amplifies recovered audio.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 200 mA

Description

Double-diode medium-gain triode for audio-frequency voltage amplification, detection, and related receiver functions.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 200 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

Rectifier peak inverse voltage: 200 V
Rectifier nominal output current: 800 mA

Published Mullard ratings and characteristics promoted from the supplied source.

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: 15000 Ω
Transconductance: 0.002 S
Amplification factor: 30
Max plate voltage: 300 V
Max plate dissipation: 1.5 W

Published Mullard ratings and characteristics promoted from the supplied 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

1951 Mullard Valve and Service Manual

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

Heater Voltage
6.3 V
Heater Current
200 mA

SECTION 3

Triode

Other

Plate Voltage
250 V
TransformerCoupledAFAmplifier
Plate Current
5 mA
TransformerCoupledAFAmplifier

Data set 02

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

I. 2 4
5 mA
Published in approved EBC33.pdf target datasheet; Section2
h max
10 mA
Published in approved EBC33.pdf target datasheet; Section2

SECTION 3

Triode

Other

I. 2 4
5 mA
Published in approved EBC33.pdf target datasheet; Section1
h max
10 mA
Published in approved EBC33.pdf target datasheet; Section1