7AH7
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BrandTung-Sol
ClassPentode
BaseLock-In 8-Pin
Filament6.3V @ 150mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2 W
Grid 2 Voltage300 V
Grid 1 Voltage-1 V
H-C Voltage90 V
Audio Performance
Key Features
- Semi-remote cut-off pentode
- Lock-in construction
- High transconductance
- Low interelectrode capacitances
- Economy of heater power
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 250V | 4400 | 1000000 | - | 6.8mA |
Application Notes
The 7AH7 is characterized by moderately high transconductance and low interelectrode capacitances. Bias voltage is approximately 2 volts, but fixed bias is not recommended.
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