Tube-number record
L14-111GH/55
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ClassInstrument Cathode-Ray Tube
Base14-pin all-glass
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
Envelope14 cm diagonal, rectangular flat-faced
Base MaterialAll glass
SectionsWriting section and viewing section
Filament / Heater
Heater NotesOne heater for writing section, two for viewing section.
Absolute Maximum Ratings
Plate Voltage9500 V
Grid 2 Voltage2000 V
Grid 1 Voltage-200 V
H-C Voltage125 V
Audio Performance
Key Features
- Variable persistence
- Internal graticule
- Metal backed phosphor
- Direct-view storage
- Double electrostatic deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Writing section | 8500 V | — | — | — | — |
| Viewing section | 7050 V | — | — | — | 0.4 mA |
Application Notes
To protect the tube against excessive surge current during erasure, an adequately dimensioned RC-network must be connected in series with the screen terminal lead. The deflection plate shield voltage should be equal to the mean y-plate potential.
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