Voltage - Triode (single) ·Triode
L21
OSRAM triode for receiving-equipment amplification, detection, or power-output service as specified in its manufacturer datasheet.
- Sections
- 1
- Base
- -
- Socket code
- B4
- Base pins
- -
- Nominal heater
- -
Description
OSRAM L21 triode for amplification, detection, or power-output service as specified in the supplied datasheet.
Socket description
European 4-pin base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B4
- Base pins
- -
- Nominal heater voltage
- -
- Nominal heater current
- -
- 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
1 physical section, each with unique specifications.
Section 1
Triode
- Plate resistance
- 18000 Ω
- Transconductance
- 0.0015 S
- Amplification factor
- 27
- Max plate voltage
- 150 V
Published ratings and characteristics promoted from the approved datasheet.
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.