Tube-number record
7B4
0 archive entries
7B4 is a tube type in the TubeDatabase archive (class: High-Mu Triode). Recorded specifications: brand Sylvania, construction Triode, socket Loctal, and maximum plate voltage 300 V. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassHigh-Mu Triode
BaseLoctal
Filament7 V @ 0.32 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater Notes7-volt heater rating corresponds to 130-volt line condition or automotive service.
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 100 V | 1150 | 85000 | 100 | 0.4 mA |
| Class A Amplifier | 250 V | 1500 | 66000 | 100 | 0.9 mA |
Application Notes
Sylvania Type 7B4 is a single-ended high-mu triode having electrical characteristics and applications similar to those for Type 6F5G. For automotive service, design centers are 90% of indicated values using a battery terminal voltage of 6.6 volts.
Datasheets
Datasheet: 7B4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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