Tube-number record
A 56-11 X
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BrandTelefunken
ClassColour TV picture tube
BaseCRT base (B12 family)
Filament— V @ 900 mA
Construction
Primary TypeDisplay / CRT
EnvelopeAll-glass, grey glass screen
Base MaterialGlass
SectionsTriple electron gun (Delta)
Filament / Heater
Heater NotesAC/DC heating, max 9.5V during heating-up period
Absolute Maximum Ratings
Plate Voltage27500 V
Grid 2 Voltage1000 V
Cathode Current1 mA
H-C Voltage250 V
Audio Performance
Key Features
- Aluminized screen
- Shadow-mask
- Rare earth phosphors
- No safety plate required (Metal shielded)
- Magnetic deflection
- Magnetic convergence
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Operation | 25000 V | — | — | — | — |
Application Notes
The tube may be used without a safety plate due to metal shielding/armoring. To prevent hum, the AC component of the heater-cathode voltage should be kept below 20V.
Datasheets
Datasheet: A56-11X.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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