7B4
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BrandSylvania
ClassHigh-Mu Triode
BaseLoctal
Filament7V @ 0.32mA
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
H-C Voltage90 V
Audio Performance
Key Features
- Lock-in construction
- Single-ended
- Suitable shielding
- Compactness
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 100V | 1150 | 85000 | 100 | 0.4mA |
| Class A Amplifier | 250V | 1500 | 66000 | 100 | 0.9mA |
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.
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