Tube-number record
AC/SP.1
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BrandEdiswan Radio (Mazda)
ClassAC Mains H.F. Pentode
Base7-pin (non-miniature)
Filament4 V @ 1 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesA.C. Mains
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Key Features
- Screened pentode
- Noise suppression
- Automatic tuning
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard | 250 V | 2700 | — | — | — |
| Noise Suppression | 250 V | 2650 | — | — | 4.9 mA |
| Automatic Tuning | 250 V | 1450 | — | — | 2.9 mA |
Application Notes
In noise suppression circuits the valve is used as an L.F. amplifier and the grid G3 is initially biased to approximately 15 to 20 volts negative. When used in automatic tuning arrangements, the tuned circuit of the oscillator is included in the anode circuit.
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