DL98
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ClassR.F. Output Pentode
BaseB7G
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation3 W
Grid 2 Voltage135 V
Grid 1 Voltage-75 V
Cathode Current32 mA
Audio Performance
Power Output1.25 W
Key Features
- R.F. output pentode
- Portable equipment
- Class C r.f. amplifier
- Oscillator
- Frequency multiplier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics Condition 1 | 90V | 1700 | 22000 | 3.2 | 15mA |
| Characteristics Condition 2 | 135V | 2150 | 22000 | 3.45 | 30mA |
| Class C Amplifier 90V | 90V | - | - | - | 15mA |
| Class C Amplifier 150V | 150V | - | - | - | 25mA |
Application Notes
When the filament sections are series connected, the lower section of the filament should be shunted by a resistor to by-pass the cathode current of the upper section.
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