Tube-number record
AC/TP
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BrandMazda
ClassTriode-Pentode
BaseNoval (B9A)
Filament4 V @ 1.25 mA
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 | 250 V | 700 | 900000 | — | 6.5 mA |
| Pentode Section (Static) | 250 V | 3400 | — | — | — |
| Triode Section (Static) | 100 V | 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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