Tube-number record
163
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ClassSharp-Cutoff Pentode
BaseOctal
Filament6.3 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeST-12
Base MaterialPhenolic
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation0.75 W
Grid 2 Voltage100 V
Cathode Current10 mA
Audio Performance
Key Features
- Specially designed for low-microphonic applications
- Sharp-cutoff characteristic
- Top-cap grid connection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection | 250 V | 1225 | 1500000 | 1500 | 2.1 mA |
Application Notes
The 163 is a version of the 6J7 specifically selected and processed for low-microphonic noise and low-hum in audio pre-amplifier stages.
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