3BY7
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BrandRogers Electronic Tubes & Components
ClassR.F. pentode with variable transconductance
BaseNoval
Filament3.4V @ 600mA
Construction
Primary TypePentode
EnvelopeT6 1/2
Base MaterialGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Cathode Current15 mA
H-C Voltage150 V
Audio Performance
Key Features
- Variable transconductance
- Wide-band amplifier
- Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation 1 | 100V | 5000 | 250000 | - | 5.5mA |
| Typical Operation 2 | 173.5V | 5990 | 300000 | - | 5.7mA |
| Typical Operation 3 | 200V | 6100 | 350000 | - | 11.4mA |
| Typical Operation 4 | 250V | 6000 | 600000 | - | 10mA |
Application Notes
When used at or near maximum ratings, it is advisable to keep Grid 1 circuit resistance as low as possible.
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