TRIPLE-GRID DETECTOR AMPLIFIER
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ClassPentode
BaseSmall 6-Pin
Filament6.3V @ 0.3mA
Construction
Primary TypePentode
EnvelopeST-12
Sections1
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Audio Performance
Key Features
- Triple-grid construction
- Detector or Amplifier capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Amplifier | 250V | 1250 | 1500000 | 1500 | 2.3mA |
Application Notes
The OCR text appears to represent the plate characteristic curves for a Type 77 tube, showing grid voltage steps and plate current readings.
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