25Z5
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BrandRCA
ClassRectifier-Doubler
BaseSmall 6-Pin
Filament25V @ 300mA
Construction
Primary TypeHigh-vacuum rectifier
Rectifier TypeFull-wave
EnvelopeST-12
SectionsDual
Filament / Heater
Heater NotesA.C. or D.C.
Absolute Maximum Ratings
Plate Voltage250 V
Cathode Current100 mA
Audio Performance
Key Features
- Full-wave high-vacuum rectifier
- Heater-cathode type
- Transformerless receivers
- Voltage doubler application
- Separate base pin for each cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Voltage Doubler | 125V | - | - | - | 100mA |
| Half-Wave Rectifier | 125V | - | - | - | 85mA |
| Half-Wave Rectifier (with series resistor) | 250V | - | - | - | 85mA |
Application Notes
On a-c input voltage above 125 volts, it is necessary to connect a 100 ohm resistor in series with each plate lead, or a 100 ohm resistor common to both plates. Sufficient ventilation should be provided to circulate air freely around the tube to prevent overheating.
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