ACHLDD

Combination receiving valve incorporating detector diodes with a triode voltage-amplifier section. It combines demodulation and low-level audio amplification within one envelope, reducing the number of separate receiver valves.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: 7
Nominal heater: 4 V / 1 A

Description

Mazda AC/HL.DD combines two separate diodes with a triode on a common cathode sleeve for detector, audio-frequency amplification and automatic-volume-control service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 7
Nominal heater voltage: 4 V
Nominal heater current: 1 A
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.

Detector/AVC diode on common cathode sleeve.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Detector/AVC diode on common cathode sleeve.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 13800 Ω
Transconductance: 0.0026 S
Amplification factor: 36
Max plate voltage: 250 V

Triode amplifier section.

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 01

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Diode

Capacitance

Diode 1 to earth capacitance
4 pF

SECTION 2

Diode

Capacitance

Diode 2 to earth capacitance
4 pF

SECTION 3

Triode

Capacitance

Anode-earth capacitance
9.75 pF
Grid-earth capacitance
5 pF
Anode-grid capacitance
2 pF