Tube-number record
25E5
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BrandRogers
ClassOutput Pentode
BaseDuodecal
Filament25 V @ 300 mA
Construction
Primary TypePentode
EnvelopeT9
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Grid 1 Voltage1000 V
Cathode Current200 mA
H-C Voltage250 V
Audio Performance
Key Features
- Output pentode
- Television line output tube
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| pentode | 100 V | 14000 | 5000 | 5.6 | 100 mA |
Application Notes
If the tube operates below the knee, Barkhausen oscillations can occur. This can be avoided by inserting a series resistor in grid No. 2 lead (min. 2200 ohms).
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