Tube-number record
D7-220 / D7-221
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BrandPhilips
ClassOscillograph Tube (CRT)
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle gun
Filament / Heater
Absolute Maximum Ratings
Audio Performance
Key Features
- Screen printed layer (zeefdrukte laag)
- Large getter option
- 7590 Enamel
- Rotation coil
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | — | — | — | — | — |
Application Notes
The D7-220 and D7-221 are intended as replacements for the DG 7-31. Document notes differences in Cathode-to-rest capacitance between the two sub-types.
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