Tube-number record
4 TP
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BrandTELEFUNKEN
ClassCathode-Ray Tube
BaseMagnal
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
Envelope4 inch flat face
Base MaterialSmall-Button Unidekar
SectionsSingle beam
Filament / Heater
Heater NotesLow current heater
Absolute Maximum Ratings
Plate Voltage5000 V
Grid 2 Voltage1200 V
Grid 1 Voltage-250 V
Cathode Current0.3 mA
H-C Voltage125 V
Audio Performance
Key Features
- Flat face
- High deflection sensitivity
- Small spot size
- Electrostatic focus
- Electrostatic deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard | 2000 V | — | — | — | — |
Application Notes
The accelerator voltage is made variable from 500 Volts to 530 Volts to provide for astigmatism control. Low current heater reduces power requirements.
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