Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode
HL23DD
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.
- Sections
- 3
- Base
- -
- Socket code
- IO
- Base pins
- -
- Nominal heater
- 2 V / 50 mA
Description
Battery-economy double-diode triode for detection, AVC and amplification.
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
- 2 V
- Nominal heater current
- 50 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
No fixed ratings are recorded for this section.
Section 2
Diode
No fixed ratings are recorded for this section.
Section 3
Triode
- Plate resistance
- 21000 Ω
- Transconductance
- 0.0012 S
- Amplification factor
- 25
- Max plate voltage
- 150 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.