303A
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BrandWestern Electric
ClassDuodiode Triode
BaseWestern Electric 144B
Filament2V @ 1.6mA
Construction
Primary TypeDuodiode Triode
EnvelopeGlass
Base MaterialMedium six-pin type
Sections3
Filament / Heater
Heater NotesIndirectly heated cathode; designed for operation on a voltage basis.
Absolute Maximum Ratings
Plate Voltage200 V
Grid 1 Voltage-10.5 V
H-C Voltage90 V
Audio Performance
Power Output0.114 W
Key Features
- Indirectly heated cathode
- Independent vacuum tube units
- Metal cap triode grid terminal
- Any mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions 1 | 135V | 829.4 | 17000 | 14.1 | 3mA |
| Recommended Operating Conditions 2 | 135V | 642.8 | 21000 | 13.5 | 2mA |
| Recommended Operating Conditions 3 | 180V | 794.1 | 17000 | 13.5 | 3.2mA |
| Maximum Operating Conditions | 200V | 609.5 | 21000 | 12.8 | 2.2mA |
Application Notes
The 303A is used as a diode detector, diode rectifier for automatic volume control (AVC), and triode audio-frequency amplifier. Diodes can be used in parallel for half-wave or push-pull for full-wave rectification.
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