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
DM70
Miniature directly heated tuning indicator for visual tuning and signal-level indication in low-power battery-operated receivers.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- Subminiature
- Socket code
- B9A
- Base pins
- 8
- Nominal heater
- 1.4 V / 25 mA
Description
Directly heated tuning indicator tube for visual indication in low-power receivers.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- Subminiature
- Socket code
- B9A
- 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
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Characteristic
HeaterOrFilamentVoltage
1.4 V
HeaterOrFilamentCurrent
25 mA
Other
Plate Voltage
85 V
Battery;Pin4Earthed
Plate Current
170 uA
Battery
GridVoltageForCompleteExtinction
-10 V
Battery
FluorescentColumnLength
10 mm
Battery
Plate Voltage
250 V
Mains
GridVoltageForCompleteExtinction
-34 V
Mains
PlateVoltageMinimum
45 V
GridResistanceMaximum
10 Mohm
Data set 04
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Other
Plate Voltage
85 V
BatteryOperation;Pin4Earthed
Plate Current
170 uA
BatteryOperation;Pin4Earthed
Fluorescent Column Length
11 mm
BatteryOperation;Pin4Earthed
Grid Voltage for Complete Extinction
-10 V
BatteryOperation;Pin4Earthed
Plate Voltage
250 V
MainsOperation;Through1.8MohmSeriesResistor
Plate Current
105 uA
MainsOperation;Through1.8MohmSeriesResistor
Fluorescent Column Length
10 mm
MainsOperation
Grid Voltage for Complete Extinction
-34 V
MainsOperation
Supply Voltage Zero Current
450 V
PublishedLimits
Supply Voltage
300 V
PublishedLimits
Anode Voltage Without Series Resistor
90 V
PublishedLimits
Minimum Anode Voltage
45 V
PublishedLimits
Anode Dissipation at <=90V
0.025 W
PublishedLimits
Anode Dissipation at 200V
0.01 W
PublishedLimits
Cathode Current
0.3 mA
PublishedLimits
Data set 05
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Application
Application
TuningIndicator text
Data set 06
1999 Philips 0-D
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Other
Anode voltage
85 V
Anode current
170 uA
Light bar length
11 mm
Maximum no-load anode voltage
450 V
Minimum anode voltage
45 V