Tube-number record
25A7GT
0 archive entries
25A7GT is a tube type in the TubeDatabase archive (class: Rectifier-Pentode). Recorded specifications: brand Hytron, year 1938, construction Display / CRT, socket Octal, and maximum plate voltage 125 V. The archive does not yet hold a photographed example of this type.
BrandHytron
ClassRectifier-Pentode
BaseOctal
Filament25 V @ 0.3 mA
Construction
Primary TypeDisplay / CRT
Rectifier TypeHalf-wave
EnvelopeT-9D
SectionsDual-purpose (Rectifier and Power Pentode)
Filament / Heater
Heater NotesTwo separate, Coated Uni-potential Cathodes. Filament sections series connected.
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode | 100 V | 1800 | 50000 | 90 | 20.5 mA |
Application Notes
Primary purpose is for conservation of space in compact receivers. Self-biasing resistor for pentode section is 625 ohms.
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