Data set 01
1937 Osram Valves
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Optimum load resistance
20000 ohm
Published operating data
Voltage - Triode (single) ·Triode
L30
OSRAM triode for receiving-equipment amplification, detection, or power-output service as specified in its manufacturer datasheet.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B4
- Base pins
- 7
- Nominal heater
- 13 V / 300 mA
Description
OSRAM L30 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
- 7
- Nominal heater voltage
- 13 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- 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
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 2860 Ω
- Transconductance
- 0.0042 S
- Amplification factor
- 12
- Max plate voltage
- 200 V
Published ratings and characteristics promoted from the approved datasheet. Osram L30 low-impedance indirectly heated receiving triode for low-frequency amplifier service and AC/DC series or parallel heater operation. Nominal heater 13 V at 0.3 A, seven-pin base. Maximum anode voltage 200 V. Manufacturer characteristic constants at its specified test point: amplification factor 12, plate resistance about 2860 Ω, gm 4.2 mA/V. The 250 V listing belongs to the adjacent H30, not L30; manufacturer suggests an approximately 6000 Ω optimum load.
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.