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
1M3
Electron-ray visual indicator for receiver tuning or electrical level indication, using a fluorescent display whose pattern changes with control voltage.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- SDN
- Socket code
- -
- Base pins
- 8
- Nominal heater
- 1.4 V / 25 mA
Description
Electron-ray tuning indicator for visual indication in low-voltage equipment. Electrical ratings and representative operating data were extracted from the approved manual page.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- SDN
- Socket code
- -
- Base pins
- 8
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 25 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
SDN - 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
Electron-ray tuning indicator for visual indication in low-voltage equipment.
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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Other
Maximum plate voltage
90 V
Minimum plate voltage
45 V
Indicator plate supply voltage
250 V
Through 1.8 megohm resistor
Data set 03
1963 Amperex Condensed
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Other
Supply and screen voltage
85 V
Screen current
0.17 mA
Grid bias for end of control range
-10 V