Tuning Indicator ·TuningIndicator
Subminiature directly heated voltage-indicator tube, DM160/6977, designed to show the switching state of flip-flop and logic circuits with a visible luminous strip.
Valvo DM160/6977 is a subminiature voltage-indicator tube designed to show the switching state of flip-flop circuits and to mount directly in printed wiring. It uses a 1.0 V directly heated cathode and a visible luminous strip.
Subminiature wire-ended
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Published promoted fields populated from the datasheet; identical repeated sections compressed where applicable.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Maximum Plate Voltage
65 V
Maximum Cathode Current
0.75 mA
Typical Plate Voltage
50 V
Plate Current at Maximum Light Output
585 µA
Data set 02
Published operating points and test conditions from this source.
LightOutput
8 mcd
PlateVoltage=50V;GridSupplyVoltage=0V
Plate To Filament Capacitance
1.1 pF
Data set 03
Published operating points and test conditions from this source.
Anode voltage
50 V
DC
Grid voltage at zero light output
3.5 V
Grid voltage at maximum light output
0 V
Rated life
20000 h
Data set 04
Published operating points and test conditions from this source.
Heater voltage
1 V
Direct AC or DC heater; +/-5% absolute limit
Heater current
30 mA
Nominal; published tolerance +/-6 mA
Guaranteed life
10000 h
Average over 100 tubes
Failure factor
1.5 permille/1000h
Published reliability factor
Isolation resistance
100 MOhm
Between two electrodes at 50 V
Luminous strip length
11 mm
Approximate
Operating supply voltage
50 V
AC heater operating data
Series/grid resistor
100 kOhm
Published operating circuit
Maximum anode supply voltage
- to 100 V
Absolute value
Maximum electrode voltage at zero current
- to 100 V
Absolute value
Maximum electrode voltage
- to 65 V
Absolute value
Maximum indicator current
- to 0.75 mA
Absolute value; 750 uA
Grid resistor
0.1 to 1 MOhm
Absolute limits
Data set 05
Published operating points and test conditions from this source.
Filament voltage
1 V
Filament current
30 mA
Plate current maximum
750 uA
Grid resistance maximum
1 Mohm
Typical plate voltage
50 V
Typical grid resistance
100000 ohm
Typical grid voltage
0 V
Typical plate current
585 uA
Alternate grid voltage
-3 V
Alternate plate current
5 uA
Application
Fluorescent light-output indicator / transducer
Data set 06
Published operating points and test conditions from this source.
Heater voltage
1 V
Nominal
Heater current
30 mA
Nominal
Maximum plate voltage
65 V
Promoted published value
Maximum cathode current
0.75 mA
Promoted published value
LIMITS OF APPLIED FILAMENT VOLTAGE 0.95
-1.05 V
AVERAGE CHARACTERISTICS 1.0 VOLTS 30 MA.
PLATE VOLTAGE
65 V
MAXIMUM RATINGS
POSITIVE GRJD SUPPLY VOLTAGE
0 V
MAXIMUM RATINGS
NEGATIVE GRID VOLTAGE
50 V
MAXIMUM RATINGS
GRID CIRCUIT RESISTANCE
7 ohm
MAXIMUM RATINGS
MINIMUM GRID CIRCUIT RESISTANCE
0.1 ohm
MAXIMUM RATINGS
PLATE VOLTAGE
50 V
TYPICAL OPERATION
WITH GRID SUPPLY VOLTAGE —
3 V
TYPICAL OPERATION
LIGHT OUTPUT MEASURED BY COMPARISON WITH A TUNGSTEN LAMP OF 1,870 °K COLOR TEMPERATURE
1870 A
TYPICAL OPERATION
Transconductance
450 uS
Promoted published value
Amplification factor
30
Promoted published value
PLATE VOLTAGE
50 V
AVERAGE CHARACTERISTICS
TRANSCONDUCTANCE
450 uS
AVERAGE CHARACTERISTICS
AMPLIFICATION FACTOR 30
30 A
AVERAGE CHARACTERISTICS
Data set 07
Published operating points and test conditions from this source.
Heater voltage
1 V
Direct AC or DC heater; +/-5% absolute limit
Heater current
30 mA
Nominal; published tolerance +/-6 mA
Guaranteed life
10000 h
Average over 100 tubes
Failure factor
1.5 permille/1000h
Published reliability factor
Isolation resistance
100 MOhm
Between two electrodes at 50 V
Luminous strip length
11 mm
Approximate
Operating supply voltage
50 V
AC heater operating data
Series/grid resistor
100 kOhm
Published operating circuit
Maximum anode supply voltage
- to 100 V
Absolute value
Maximum electrode voltage at zero current
- to 100 V
Absolute value
Maximum electrode voltage
- to 65 V
Absolute value
Maximum indicator current
- to 0.75 mA
Absolute value; 750 uA
Grid resistor
0.1 to 1 MOhm
Absolute limits