Tuning Indicator ·Triode-TuningIndicator
Vacuum tuning indicator with integral triode control section, converting receiver control-voltage changes into a visible fluorescent tuning display.
Vacuum tuning-indicator tube with triode control section.
Small 6-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1H | — | H — Heater EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 127, 6R |
| PIN2D | A | OTHER — Other Identified Element Source D denotes deflecting electrode; generic OTHER element 40 pending canonical refinement | Unverified EIA Base Connections, printed page 127, 6R |
| PIN3G1 | A | G1 — Control Grid EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 127, 6R |
| PIN4T | A | T — Target EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 127, 6R |
| PIN5K | A | K — Cathode EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 127, 6R |
| PIN7H | — | H — Heater EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 127, 6R |
2 physical sections, each with unique specifications.
Section 1
Electron-ray tuning-indicator section; canonical SectionType fallback Other.
Section 2
No fixed ratings are recorded for this section.
Internal control/amplifier triode section; added during tuning-indicator physical-section reconciliation.
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.
Plate supply voltage maximum
250 V
TuningIndicator
Target voltage maximum
250 V
TuningIndicator
Plate supply voltage
250 V
TuningIndicator
Target voltage
250 V
TuningIndicator
Plate resistor
1 MΩ
TuningIndicator
Target current
3 mA
TuningIndicator
Plate current
0.24 mA
ZeroBias
Grid bias
-22 V
MinimumShadowDiameter
Grid bias
0 V
MaximumShadowDiameter
Data set 02
Published operating points and test conditions from this source.
Triode plate current maximum
0.24 mA
Data set 03
Published operating points and test conditions from this source.
Plate voltage
250 V
TuningIndicator; Through1Megohm
Target voltage
250 V
TuningIndicator
Grid voltage for maximum illumination
-22 V
TuningIndicator
Grid voltage for minimum illumination
0 V
TuningIndicator