12AH8
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BrandBrimar
ClassTriode-Heptode Frequency Changer
BaseB9A
Filament6.3V @ 0.3mA
Construction
Primary TypeTriode-Heptode
EnvelopeT6 1/2
Base MaterialNoval
SectionsTwo units mounted one above the other
Filament / Heater
Heater NotesCentre tapped heater provided
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.5 W
Grid 2 Voltage125 V
Cathode Current17.5 mA
H-C Voltage250 V
Audio Performance
Key Features
- Miniature
- Noval based
- High conversion conductance
- Centre tapped heater
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode Section (100V HT) | 100V | 520 | 600000 | - | 2.5mA |
| Heptode Section (250V HT) | 250V | 550 | 1500000 | - | 2.6mA |
| Triode Section | 100V | 3500 | 4850 | 17 | 14.6mA |
Application Notes
Intended for use in all wave broadcast and communication receivers. Suitable for VHF 88 to 108 Mc/s band. AVC may be applied to the control grid.
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