Data set 01
1953 AEG
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Typical Plate Voltage
250 V
Typical Plate Current
1.25 mA
Capacitance
GridPlateCapacitance
1.7 pF
Grid Earth Capacitance
1.6 pF
Voltage - Dual Triode (similar) ·Triode-Triode
ECC803S
Special-quality high-mu AF twin triode with separate cathodes, designed for high reliability and long life in professional low-level audio and voltage-amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 12.6 V / 150 mA
Description
Special-quality AF twin triode with separate cathodes, high reliability, and long life; equivalent to 6057.
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
- 330 V
- Max plate dissipation
- 1.2 W
- Max cathode current
- 9 mA
Representative row for two electrically identical triode sections.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 62500 Ω
- Transconductance
- 0.0016 S
- Amplification factor
- 100
- Max plate voltage
- 330 V
- Max plate dissipation
- 1.2 W
- Max cathode current
- 9 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 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
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
Data set 04
2026 JJ Electronic
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Ik
9 mA
Published value
Ub
250
Published value
Ra
47
Published value
Ia
1.18
Published value
Rg
1
Published value
Characteristics
Ua
250 V
Published value
Rk
1
Published value
Ia
1.2 mA
Published value
S
1600 µS
Published value
Ri
62.5 kΩ
Published value
µ
100
Published value
Capacitance
cg/k
1.6
Published value
ca
0.46
Published value
cg/a
1.7
Published value