Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Diode
Application
Service
Detector diode
SECTION 2
Triode
Application
Service
Voltage amplifier
Voltage - Triode (with diode, heptode or hexode) ·Diode-Triode
1LH4
Directly heated battery diode-triode combining detection with high-mu voltage amplification. The diode recovers the received signal while the triode provides substantial subsequent gain with economical filament consumption.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 5AG
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 1.4 V / 50 mA
Description
1LH4 is listed as a diode high-mu triode in the supplied receiving-tube handbook. It uses a 1.4 V, 0.05 A directly heated filament. The handbook publishes maximum ratings and representative operating characteristics for its intended service.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 5AG
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 50 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
5AG - 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
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Minimum diode current 0.5 mA with 4 V DC applied.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 240000 Ω
- Transconductance
- 0.000275 S
- Amplification factor
- 66
- Max plate voltage
- 110 V
High-mu triode unit.
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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 2
Triode
Other
Maximum plate voltage
110 V
Published handbook rating
Plate voltage
90 V
ClassA
Control-grid voltage
0 V
ClassA
Plate current
0.15 mA
ClassA
Characteristic
Plate resistance
240000 ohm
Published handbook characteristic
Transconductance
275 µS
Published handbook characteristic
Amplification factor
65
Published handbook characteristic
Filament voltage
1.4 V
DirectlyHeated DC filament
Filament current
50 mA
DirectlyHeated DC filament
Data set 03
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 2
Triode
Characteristic
Minimum Diode Current
0.5 mA
DiodeVoltage=4V