Tube-number record
DH 10-78
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DH 10-78 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube). Recorded specifications: brand Philips, construction Display / CRT, socket Diheptal, and maximum plate voltage 4000 V. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassCathode Ray Tube
BaseDiheptal
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeFlat-face screen
SectionsHelical post-acceleration electrode
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; parallel supply
Absolute Maximum Ratings
Plate Voltage4000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Post-Acceleration | 2000 V | — | — | — | 0.0005 mA |
| High Post-Acceleration | 4000 V | — | — | — | 0.0005 mA |
| High Sensitivity | 4000 V | — | — | — | 0.0005 mA |
Application Notes
The post-deflection acceleration helix is connected between g6 and the isolation shield g5. For optimum sharpness it may be desirable to apply a small potential difference between the y plates and the grids No.2 and 4.
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