Tube-number record
25A6GT
0 archive entries
25A6GT is a tube type in the TubeDatabase archive (class: Power Pentode). Recorded specifications: brand Hytron, year 1938, construction Pentode, socket Octal, and maximum plate voltage 180 V. The archive does not yet hold a photographed example of this type.
BrandHytron
ClassPower Pentode
BaseOctal
Filament25 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeT-9
SectionsSingle
Filament / Heater
Heater NotesVoltage between negative end of heater and cathode should not exceed 90 volts DC.
Absolute Maximum Ratings
Plate Voltage180 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Single Tube (Condition 1) | 95 V | 2000 | 45000 | 90 | 20 mA |
| Class A Single Tube (Condition 2) | 135 V | 2450 | 35000 | 85 | 37 mA |
| Class A Single Tube (Condition 3) | 180 V | 2500 | 40000 | 100 |
Application Notes
Especially adapted to universal AC-DC receivers or receivers operating directly from DC power lines. Power output is relatively large for the low voltages available. If resistance coupling is used, grid return resistance limited to 0.25 megohm (self-bias) or 0.1 megohm (fixed-bias).
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