B339

High-amplification dual triode with separate cathodes for low-frequency voltage amplification and phase-inverter service, with a center-tapped heater for 6.3- or 12.6-volt operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 12.6 V / 150 mA

Description

TESLA ECC83 is a high-amplification dual triode with separate cathodes for low-frequency voltage amplification and phase-inverter service. Its heater supports 6.3 V parallel or 12.6 V series operation.

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: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 12.6 V
Nominal heater current: 150 mA
Parallel heater voltage: 6.3 V
Parallel heater current: 300 mA
Series capable: Yes

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.0016 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 8 mA

Representative section for two equal triode systems.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.0016 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 8 mA

Second physical triode section; added to align rows with SectionCount.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Series heater voltage
12.6 V
Series heater current
150 mA
Parallel heater voltage
6.3 V
Parallel heater current
300 mA
Maximum plate voltage
300 V
Maximum plate dissipation per section
1 W

Characteristic

Amplification factor
100
Transconductance
1600 uS
Typical amplification factor
100

Capacitance

Grid-plate capacitance
1.7 pF
Grid-cathode capacitance
1.6 pF
Plate-cathode capacitance
0.46 pF

Data set 02

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Interelectrode capacitances
Published
See source sheet for electrode-specific capacitance values