HD22

Battery double-diode triode combining radio detection and related signal rectification with subsequent audio-frequency amplification, consolidating detector, control-voltage, and AF functions in one valve.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: B5
Base pins: -
Nominal heater: 2 V / 200 mA

Description

HD22: OSRAM combined double-diode triode. The complete approved OSRAM sheet was read for construction, characteristics, operating data, and application guidance.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
Base pins: -
Nominal heater voltage: 2 V
Nominal heater current: 200 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 18000 Ω
Transconductance: 0.0015 S
Amplification factor: 27
Max plate voltage: 150 V

Published characteristics promoted where reliably identified; additional source values retained below.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added during approved section-structure reconciliation.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added during approved section-structure reconciliation.

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

1937 Osram Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater/filament voltage
2 V
Heater/filament current
200 mA
Plate impedance
18000 ohm
Mutual conductance
1500 uS
Amplification factor
27
Application
Detector and automatic volume control
Separate triode and diode filament systems
Yes

Other

Maximum anode voltage
150 V

Data set 02

193X Osram

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Filament/heater voltage
2 V
Filament/heater current
200 mA
Mutual conductance
1500 uS