ABC1
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BrandPhilips
ClassDuodiode-Triode
Base8-pin Side Contact (P-base)
Filament4V @ 650mA
Construction
Primary Typeindirectly heated
EnvelopeGlass
Base MaterialMetal/Phenolic
SectionsTriode and 2 Diodes
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
H-C Voltage50 V
Audio Performance
Key Features
- Simultaneous detection and AF amplification
- Shielded diode section
- Delayed automatic volume control (AVC)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode amplifier | 250V | 2000 | 13500 | 27 | 4mA |
| Resistance-coupled amplifier | 250V | 3600 | - | - | 4mA |
Application Notes
With Ra = 0.32 MOhm, gain is 20x. With Ra = 0.1 MOhm, gain is 19x.
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