Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 3
Triode
Capacitance
Anode-grid capacitance
3.5 pF
Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode
HL42DD
Receiver tube combining radio detection or demodulation with associated audio amplification or control-voltage rectification. Manufacturer documentation places these functions directly within radio receiver signal processing.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- -
- Socket code
- IO
- Base pins
- -
- Nominal heater
- 4 V / 650 mA
Description
Indirectly heated double-diode triode for receiver amplifier/detector service.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- -
- Nominal heater voltage
- 4 V
- Nominal heater current
- 650 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
3 physical sections, each with unique specifications.
Section 1
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Diode section 1.
Section 2
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Diode section 2.
Section 3
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 8000 Ω
- Transconductance
- 0.0029 S
- Amplification factor
- 23
- Max plate voltage
- 250 V
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.