Data set 01
2026 Genalex Rebrand
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Plate Current
1.05 to 2 mA
Plate 250 V; grid -2 V
Voltage - Dual Triode (similar high frequency) ·Triode-Triode
CV4004
High-gain miniature twin triode of the ECC83/12AX7 family, designed for low-frequency voltage amplification in radio and audio-frequency electronic equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 12.6 V / 185 mA
Description
Miniature twin triode with equipotential cathodes, designed to amplify low-frequency voltage in radio engineering devices.
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
- 185 mA
- Parallel heater voltage
- 6.3 V
- Parallel heater current
- 370 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
- Transconductance
- 0.0014 S
- Amplification factor
- 83
- Max plate voltage
- 330 V
- Max plate dissipation
- 1.2 W
- Max cathode current
- 9 mA
Representative section for two electrically identical sections.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0014 S
- Amplification factor
- 83
- Max plate voltage
- 330 V
- Max plate dissipation
- 1.2 W
- Max cathode current
- 9 mA
Second physical triode restored.
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
2026 Mullard Rebrand
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater current at 6.3 V
350 to 390 mA
Published min/max range
Heater current at 12.6 V
175 to 195 mA
Published min/max range