Data set 01
1955 Marconi
Published operating points and test conditions from this source.
SECTION 1
Heptode
Characteristic
Heater/Filament Voltage
2 V
Other
Anode Voltage
150 V
Screen Voltage
70 V
Application
Frequency-changer service
Explicit
Voltage Radio Detector Converter ·Heptode
X22
Radio receiver frequency changer designed for superheterodyne mixer and oscillator service. Its multi-grid construction performs signal conversion, often integrating local oscillation and mixing within one valve.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 2 V / -
Description
Two-volt heptode frequency changer for battery receivers.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 2 V
- Nominal heater current
- -
- 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
1 physical section, each with unique specifications.
Section 1
Heptode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 150 V
- Max screen voltage
- 70 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.