Tube-number record
3/21 AM
0 archive entries
3/21 AM is a tube type in the TubeDatabase archive (class: High Resolution Cathode Ray Tube). Recorded specifications: brand Ferranti, year 1961, construction Triode, socket Duodecal, and maximum plate voltage 25000 V. The archive does not yet hold a photographed example of this type.
BrandFerranti
ClassHigh Resolution Cathode Ray Tube
BaseDuodecal
Filament6.3 V @ 0.3 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage25000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 20000 V | — | — | — | — |
Application Notes
X-ray shielding may be required if anode voltage exceeds 16kV.
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