Tube-number record
PA.20
0 archive entries
PA.20 is a tube type in the TubeDatabase archive (class: Directly Heated Mains Output Triode). Recorded specifications: brand Mazda, construction Triode, socket 4-pin, maximum plate voltage 300 V, and maximum plate dissipation 15 W. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassDirectly Heated Mains Output Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Straight (Single-Ended) | 250 V | 5000 | 1200 | 6 | 42 mA |
| Straight (Single-Ended) | 250 V | 5400 | 1150 | 6.2 | 50 mA |
| Straight (Single-Ended) | 300 V | 5400 | 1200 | 6.5 | 48 mA |
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.
Datasheets
Datasheet: PA20.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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