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Tube-number record
7591
7 archive entries
BrandSylvania
ClassPower Output Pentode
BaseOctal
Filament6.3 V @ 0.8 mA
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 | 300 V | 10200 | 29000 | — | 60 mA |
| Ultra-Linear Operation Class AB1 Push-Pull | 400 V | — | — | — | 80 mA |
| Pentode Operation Class AB1 Push-Pull Amp | 450 V | — | — | — | 66 mA |
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.
Datasheets
Datasheet: 7591.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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