PA.20
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BrandMazda
ClassDirectly Heated Mains Output Triode
Base4-pin
Construction
Primary Typetriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation15 W
Audio Performance
Typical THD5%
Power Output9 W
Key Features
- Directly heated
- Low hum level for AC mains receivers
- Identical to PP3/250 except filament voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Straight (Single-Ended) | 250V | 5000 | 1200 | 6 | 42mA |
| Straight (Single-Ended) | 250V | 5400 | 1150 | 6.2 | 50mA |
| Straight (Single-Ended) | 300V | 5400 | 1200 | 6.5 | 48mA |
| Push-Pull | 250V | 5000 | 1200 | - | 84mA |
| Push-Pull | 300V | 5000 | 1200 | - | 84mA |
Application Notes
Self-bias is recommended using a 50uF bypass condenser. Maximum grid circuit resistance varies between 0.05 and 0.5 megohms depending on anode dissipation and bias method.
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