Tube-number record
5A/128B
0 archive entries
5A/128B is a tube type in the TubeDatabase archive (class: R.F. Pentode). Recorded specifications: brand Standard Telephones and Cables (STC), construction Pentode, socket 5-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandStandard Telephones and Cables (STC)
ClassR.F. Pentode
Base5-pin
Filament4 V @ 1 mA
Construction
Primary TypePentode
Envelopeglass
Sectionssingle
Filament / Heater
Heater NotesIndirectly-heated oxide-coated
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Pentode Operation (Va 250) | 250 V | 3000 | 800000 | — | 3.9 mA |
| RF Pentode Operation (Va 200) | 200 V | 3000 | 800000 | — | 3.8 mA |
| RF Pentode Operation (Va 150) | 150 V | 3000 | 800000 | — |
Application Notes
RF Pentode designed for high frequency applications with low inter-electrode capacitance.
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