7591
7 Tubes in archive
BrandSylvania
ClassPower Output Pentode
BaseIntermediate Shell Octal 7-Pin
Filament6.3V @ 0.8mA
Construction
Primary TypePentode
EnvelopeT-9
Base MaterialIntermediate Shell Octal
SectionsSingle
Filament / Heater
Heater NotesMaximum Heater-Cathode Voltage: 200V
Absolute Maximum Ratings
Plate Voltage550 V
Plate Dissipation19 W
Grid 2 Voltage440 V
Cathode Current85 mA
H-C Voltage200 V
Audio Performance
Typical THD1.5%
Power Output45 W
Key Features
- Low distortion
- Ultra-linear operation
- Push-Pull Class AB1
- 45W maximum power output
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Operation Class A1 Amp | 300V | 10200 | 29000 | - | 60mA |
| Ultra-Linear Operation Class AB1 Push-Pull | 400V | - | - | - | 80mA |
| Pentode Operation Class AB1 Push-Pull Amp | 450V | - | - | - | 66mA |
Application Notes
Grid No. 2 Dissipation may reach 6W during speech and music. For efficient operation, Pins 4 and 8 should be externally tied together. Ultra-linear operation uses a 40% tap.
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