Tube-number record
27SP4
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BrandSylvania
ClassTelevision Picture Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeRectangular Glass
EnvelopeJ1-21 Recessed Small Cavity Cap
SectionsSingle
Filament / Heater
Heater Notes0.6 Ampere
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage500 V
Grid 1 Voltage-125 V
H-C Voltage180 V
Audio Performance
Key Features
- 27” Direct Viewed
- Rectangular Glass Type
- Spherical Faceplate
- Gray Filter Glass
- Magnetic Deflection
- Electrostatic Focus
- Single Field Ion Trap
- Aluminized Screen
- External Conductive Coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions | 18000 V | — | — | — | — |
Application Notes
External conductive coating must be grounded. Brilliance and definition decrease with decreasing anode voltage. X-ray radiation shielding may be necessary if operated higher than 16,000 volts.
Datasheets
Datasheet: 27SP4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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