AC/TP
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BrandMazda
ClassTriode-Pentode
BaseStandard 9-pin
Filament4V @ 1.25mA
Construction
Primary TypeIndirectly heated
EnvelopeBulb, metallised
SectionsTriode Pentode
Filament / Heater
Heater NotesIt is recommended that the voltage across the heater pins should be 4.0 volts +/- 5 per cent.
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Cathode Current2 mA
Audio Performance
Key Features
- Variable-mu characteristics
- Metallised bulb
- High working impedance
- Low oscillator harmonic content
- Independent triode/pentode sections
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Self-oscillating frequency changer | 250V | 700 | 900000 | - | 6.5mA |
| Pentode Section (Static) | 250V | 3400 | - | - | - |
| Triode Section (Static) | 100V | 1400 | - | 30 | - |
Application Notes
Designed for operation as a self-oscillating frequency changer. Suitable for use with diode or amplified automatic volume control. Recommended heterodyne injection in common cathode circuit. For frequencies above 2 Mc/s, AC/TH1 is preferred.
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