Voltage Triode Pentode ·Pentode-Triode
4CM8
High-mu triode and sharp-cutoff pentode combination for amplifier and television video service.
- Sections
- 2
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 4.7 V / 600 mA
Description
High-mu triode and sharp-cutoff pentode for amplifier and video service.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 4.7 V
- Nominal heater current
- 600 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
- Transconductance
- 0.002 S
- Amplification factor
- 100
- Max plate voltage
- 300 V
- Max plate dissipation
- 1 W
Published source values promoted where applicable.
Section 2
Pentode
- Transconductance
- 0.0062 S
- Max plate voltage
- 300 V
- Max plate dissipation
- 2 W
Published source values promoted where 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.