12DW7
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BrandSylvania
ClassDissimilar Double Triode
BaseE9-1, Small Button 9-Pin
Filament12.6V @ 150mA
Construction
Primary TypeTriode
EnvelopeT-6 1/2
Base MaterialGlass
Sections2 dissimilar sections
Filament / Heater
Heater NotesSeries/Parallel
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3.3 W
Cathode Current22 mA
H-C Voltage200 V
Audio Performance
Key Features
- Two dissimilar triodes
- High gain voltage amplifier
- Cathodyne type phase-inverter
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Section 1 Class A1 Amplifier | 100V | 1250 | 80000 | 100 | 0.5mA |
| Section 1 Class A1 Amplifier | 250V | 1600 | 62500 | 100 | 1.2mA |
| Section 2 Class A1 Amplifier | 100V | 3100 | 6500 | 20 | 11.8mA |
| Section 2 Class A1 Amplifier | 250V | 2200 | 7700 | 17 | 10.5mA |
Application Notes
Type 12DW7 contains two dissimilar triodes. Section 1 is similar to 12AX7 and Section 2 is similar to 12AU7.
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