Tube-number record
7AD7
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BrandTUNG-SOL
ClassSharp Cut-off Pentode Voltage Amplifier
BaseLoctal
Filament6.3 V @ 0.6 mA
Construction
Primary TypePentode
EnvelopeT-9 Glass
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation10 W
Grid 2 Voltage300 V
H-C Voltage90 V
Audio Performance
Key Features
- High Transconductance
- Lock-in Construction
- Wide-band IF/Video Amplifier Use
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 300 V | 9500 | 300000 | — | 28 mA |
| Class A Television Amplifier | 300 V | — | — | — | 25 mA |
Application Notes
The 7AD7 is characterized by a high value of transconductance which makes it useful in wide-band intermediate frequency or video amplifiers.
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