Tube-number record
DIRECT-VIEW PICTURE TUBE
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BrandTung-Sol
ClassCathode Ray Tube
BaseDuodecal
Filament6.3 V @ 600 mA
Construction
Primary TypeOther / special
EnvelopeRectangular Glass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
H-C Voltage180 V
Audio Performance
Key Features
- Spherical Faceplate
- Grey Filter Faceplate
- Magnetic Focus & Deflection
- External Single Field Ion Trap
- Aluminized Screen (21ZP4B only)
- External Conductive Coating (21ZP4A, 21ZP4B only)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Television Application | 16000 V | — | — | — | — |
Application Notes
Cathode should be returned to one side or to the mid-tap of the heater transformer winding. If operated in excess of 16,000V, X-ray radiation shielding may be necessary.
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