Tube-number record
AT4
0 archive entries
AT4 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Mullard, construction Triode, base Ceramic, socket Acorn, maximum plate voltage 200 V, and maximum plate dissipation 1.1 W. The archive does not yet hold a photographed example of this type.
BrandMullard
ClassTriode
BaseAcorn
Filament4 V @ 250 mA
Construction
Primary TypeTriode
EnvelopeAcorn
Base MaterialCeramic
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 180 V | 2000 | — | — | 4.5 mA |
| Oscillator or H.F. Amplifier (Class C) | 180 V | — | — | — | 8 mA |
| Anode Detector | 180 V | — | 250000 | — | 0.2 mA |
Application Notes
It is essential that components, layout and screening conform to the requirements of the frequency. Leads should be of minimum length. Connections must not be soldered to the contacts on the valve.
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