Tube-number record
7B5-LT
0 archive entries
7B5-LT is a tube type in the TubeDatabase archive (class: Power Amplifier Pentode). Recorded specifications: construction Pentode, base Small wafer octalox with sleeve, socket Octal, maximum plate voltage 345 V, and maximum plate dissipation 8.5 W. The archive does not yet hold a photographed example of this type.
ClassPower Amplifier Pentode
BaseOctal
Filament6.3 V @ 400 mA
Construction
Primary TypePentode
EnvelopeT-9
Base MaterialSmall wafer octalox with sleeve
SectionsSingle
Filament / Heater
Heater NotesNominal value: 7.0V, 430mA
Absolute Maximum Ratings
Plate Voltage345 V
Plate Dissipation8.5 W
Grid 2 Voltage250 V
Audio Performance
Typical THD11%
Power Output3.4 W
Key Features
- Small wafer octalox 8-pin with sleeve
- Vertical or Horizontal operating position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A (100V) | 100 V | 1500 | 104000 | — | 9 mA |
| Class A (250V) | 250 V | 2300 | 68000 | — | 32 mA |
| Class A (315V) | 315 V | 2100 | 75000 | — | 25.5 mA |
Application Notes
In circuits where the cathode is not directly connected to the heater, potential difference between heater and cathode should be kept as low as possible. Maximum grid circuit resistance is 0.1 megohm for fixed bias and 1.0 megohm for cathode bias.
Datasheets
Datasheet: 7B5-LT.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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