Data set 01
1953 Amperex
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Other
Supply voltage maximum
300 V
Supply voltage at zero plate current
450 V
Tuning Indicator ·TuningIndicator
DM71
Subminiature directly heated electron-ray indicator for compact battery receivers, providing visual signal-strength or tuning indication with very low filament consumption.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- Subminiature
- Socket code
- -
- Base pins
- 8
- Nominal heater
- 1.4 V / 25 mA
Description
DM71 is listed in the supplied Amperex material as a subminiature electron-ray tuning indicator. Published ratings and characteristics were captured from the supplied table.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- Subminiature
- Socket code
- -
- Base pins
- 8
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 25 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- Yes
Subminiature - 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
Tuning Indicator
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 90 V
- Max plate dissipation
- 0.045 W
- Max cathode current
- 0.3 mA
Published ratings/characteristics promoted where applicable; additional values retained as parameters.
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 02
1963 Amperex Condensed
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Characteristic
Heater voltage
1.4 V
Published rating
Heater current
25 mA
Published rating
Other
Target/anode voltage
85 V
TuningIndicator
Target/anode current
0.17 mA
TuningIndicator
Data set 03
1973 Mazda Valves Binder 2
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Other
HeaterVoltageNominal
1.4 V
Nominal
HeaterCurrentNominal
25 mA
Nominal
Maximum Plate Voltage
90 V
Maximum Plate Dissipation
0.025 W
Maximum Cathode Current
0.3 mA