Tube-number record
6H21B
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ClassDouble triode
BaseFlexible / flying leads
Filament6.3 V @ 355 mA
Construction
Primary TypeDual triode
EnvelopeSuperminiature glass bulb
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1 W
Grid 1 Voltage-50 V
Cathode Current10 mA
H-C Voltage200 V
Audio Performance
Key Features
- Superminiature
- Resistant to high humidity
- Vibration resistant up to 15g
- Impact resistant up to 500g
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Low-frequency voltage amplifier | 200 V | 3800 | 21578 | 82 | 3.5 mA |
Application Notes
Designed for amplification of low-frequency voltage.
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