Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Maximum heater-cathode voltage
150 V
Capacitance
Pentode input capacitance
6.1 pF
Pentode output capacitance
3.3 pF
Voltage Triode Pentode ·Pentode-Triode
ECF202
Triode-pentode combination for electronic signal service; available source material does not establish a narrower functional application confidently.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 380 mA
Description
Triode-pentode developed for SECAM color-television decoder circuits, including chrominance subcarrier and output amplification.
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
- 380 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
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0095 S
- Amplification factor
- 50
- Max plate voltage
- 400 V
- Max plate dissipation
- 1.5 W
Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when applicable.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.014 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 2.1 W
- Max screen dissipation
- 0.75 W
- Max cathode current
- 20 mA
Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when applicable.
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
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater voltage
6.3 V
Published nominal value
Heater current
380 mA
Published nominal value
Transconductance
9500 µS
Published nominal or operating characteristic
SECTION 2
Pentode
Characteristics
Heater voltage
6.3 V
Published nominal value
Heater current
380 mA
Published nominal value
Transconductance
14000 µS
Published nominal or operating characteristic
Other
Pentode transconductance
14 mA/V
Chrominance subcarrier amplifier
Triode transconductance
9.5 mA/V
Chrominance output amplifier