6057

Special-quality high-mu AF twin triode, co-designated ECC803S, designed for high reliability and long life in low-level audio and voltage-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Special-quality AF twin triode with separate cathodes, high reliability, and long life; equivalent to 6057. This is the 6057 co-designation of ECC803S.

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: 6.3 V
Nominal heater current: 300 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: 59000 Ω
Transconductance: 0.0016 S
Amplification factor: 95
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 8 mA

Two identical triode systems; characteristic point 250 V, 1.25 mA, gm 1.6 mA/V, mu 95.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 59000 Ω
Transconductance: 0.0016 S
Amplification factor: 95
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 8 mA

Second physical triode section; electrically identical twin section.

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

1954 STC Brimar

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage series
12.6 V
Series
Heater current series
150 mA
Series
Heater voltage parallel
6.3 V
Parallel
Heater current parallel
300 mA
Parallel

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
300 mA
EquivalentDesignation
ECC803S

Data set 03

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