DL93
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BrandMullard
ClassOutput Pentode
BaseB7G
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation2 W
Grid 2 Voltage135 V
Grid 1 Voltage-30 V
Cathode Current25 mA
Audio Performance
Typical THD5%
Power Output0.6 W
Key Features
- Centre-tapped filament
- Suitable for R.F. and A.F. applications
- Intermittent operation rating for RF
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF Amplifier (Parallel Filament) | 135V | 1900 | 90000 | - | 14.8mA |
| Class A AF Amplifier (Parallel Filament) 2 | 150V | 1900 | 100000 | - | 13.3mA |
| RF Power Amplifier at 50 Mc/s | 150V | - | - | - | 18.3mA |
Application Notes
For series filament operation a shunting resistor must be connected across one filament section between pins 1 and 5 to by-pass excess cathode current.
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