Tube-number record
PP.3521
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PP.3521 is a tube type in the TubeDatabase archive (class: AC/DC Mains Output Triode). Recorded specifications: brand Mazda, construction Triode, socket 7-pin (non-miniature), maximum plate voltage 250 V, and maximum plate dissipation 15 W. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassAC/DC Mains Output Triode
Base7-pin (non-miniature)
Filament35 V @ 200 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesDesigned to operate at 0.2 amp series heater string.
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single (Condition 1) | 200 V | 10000 | 600 | 6 | 70 mA |
| Single (Condition 2) | 175 V | 10000 | 600 | 6 | 60 mA |
| Push-Pull | 200 V | 10000 | 600 | 6 | 140 mA |
Application Notes
Each valve must be individually self-biased. A 360 ohm resistance should be inserted in each cathode lead and bypassed with a high-capacity condenser. Grid to cathode resistance must not exceed 150,000 ohms.
Datasheets
Datasheet: PP3521.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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