Tube-number record
D7-220GH
0 archive entries
D7-220GH is a tube type in the TubeDatabase archive (class: Instrument Cathode-Ray Tube). Recorded specifications: brand Mullard, construction Display / CRT, socket CRT base (B12 family), maximum plate voltage 2200 V, and maximum plate dissipation 0.003 W. The archive does not yet hold a photographed example of this type.
BrandMullard
ClassInstrument Cathode-Ray Tube
BaseCRT base (B12 family)
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular flat faced
SectionsSingle
Filament / Heater
Heater NotesIndirect by a.c. or d.c.; parallel supply
Absolute Maximum Ratings
Plate Voltage2200 V
Plate Dissipation0.003 W
Grid 1 Voltage-200 V
H-C Voltage125 V
Audio Performance
Key Features
- 7 cm diagonal
- Rectangular flat faced
- Monoaccelerator
- Electrostatic focusing
- Double electrostatic deflection
- Integrated rotation coil
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 1000 V | — | — | — | 0.01 mA |
Application Notes
Primarily intended for use in inexpensive oscilloscopes and monitoring devices. Low impedance deflection plate drive is desirable if full deflection capabilities are used.
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