Tube-number record
P.A.40
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BrandEdiswan (Mazda)
ClassDirectly Heated Mains Output Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage450 V
Plate Dissipation40 W
Audio Performance
Typical THD5%
Power Output42 W
Key Features
- Directly heated
- Public address equipment use
- Class AB operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rating Characteristics | 100 V | 10000 | 425 | 4.25 | — |
| Push-Pull Class AB (400V) | 400 V | 4500 | — | — | 50 mA |
| Push-Pull Class AB (450V) | 450 V | 4500 | — | — | 55 mA |
Application Notes
The valve should only be used with individual bias adjustment from a separate source to give the correct quiescent feed current. The grid-cathode resistance should not exceed 50,000 ohms. Not intended for positive drive conditions.
Datasheets
Datasheet: PA40.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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