Tuning Indicator ·Triode-TuningIndicator
Series-heater electron-ray indicator with amplifying triode, designed for sensitive visual tuning indication in 300 mA heater-chain equipment.
300 mA series-heater electron-ray indicator tube with amplifying triode for tuning indication.
Small-button Noval 9-contact
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.
2 physical sections, each with unique specifications.
Section 1
Published values promoted where clearly readable; identical repeated sections compressed when applicable.
Section 2
No fixed ratings are recorded for this section.
Published section data from supplied datasheet.
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.
Heater voltage
4.5 V
Published nominal value or midpoint of published range
Heater current
300 mA
Published nominal value or midpoint of published range
Anode-cathode capacitance
0.8 pF
Published first-page value
Data set 02
Published operating points and test conditions from this source.
Supply voltage
170 V
TuningIndicator
Target voltage
170 V
TuningIndicator
Plate/deflector resistor
470 kΩ
TuningIndicator
Grid resistor
3 MΩ
TuningIndicator
Grid voltage for maximum shadow
-15 V
TuningIndicator;170V
Plate plus deflector current at zero bias
0.3 mA
TuningIndicator;170V
Target current at zero bias
0.6 mA
TuningIndicator;170V
Supply voltage
220 V
TuningIndicator
Grid voltage for maximum shadow
-19.5 V
TuningIndicator;220V
Target current at zero bias
0.85 mA
TuningIndicator;220V
Shadow length at zero bias
20 mm
TuningIndicator;170V