6550
2 Tubes in archive
BrandTUNG-SOL
ClassPENTODE
BaseOctal
Filament6.3V @ 1600mA
Construction
Primary TypeBeam Pentode
EnvelopeST-16
Base MaterialLarge Wafer Octal with Barriers
SectionsSingle
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage660 V
Plate Dissipation42 W
Grid 2 Voltage440 V
Cathode Current190 mA
H-C Voltage300 V
Audio Performance
Typical THD7%
Power Output100 W
Key Features
- Beam Pentode Power Amplifier
- 42 Watt Plate Dissipation
- Designed for Audio Service
- Any Mounting Position
- Low Loss B7-99 base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Tube Class A1 Pentode | 250V | 11000 | 15000 | - | 140mA |
| Single Tube Class A1 Pentode | 400V | - | - | - | 87mA |
| Push-Pull Class AB1 Pentode (Fixed Bias) | 600V | - | - | - | 100mA |
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