Tube-number record
EM 84
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EM 84 is a tube type in the TubeDatabase archive (class: Indicator Tube). Recorded specifications: brand Philips, construction Display / CRT, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 0.5 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassIndicator Tube
BaseNoval (B9A)
Filament6.3 V @ 210 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation0.5 W
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current3 mA
H-C Voltage100 V
Audio Performance
Key Features
- Amplifying triode section
- Linear indicator display
- A.C. or D.C. heater supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Tuning Indicator (Grid 0V) | 250 V | — | 470000 | — | 1 mA |
| Tuning Indicator (Grid -22V) | 250 V | — | 470000 | — | 1.8 mA |
Application Notes
Used as a tuning indicator or for modulation control.
Datasheets
Datasheet: EM84.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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