DY 900
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BrandTelefunken
ClassHigh voltage rectifier for TV receivers
BasePico 7 (Miniatur)
Filament1.4V @ 170mA
Construction
Primary TypeHalf-wave rectifier
Rectifier TypeVacuum rectifier
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated; Parallel supply. Adjustment via optical comparison of heating color to auxiliary tube is permitted for RF or flyback pulse feeding.
Absolute Maximum Ratings
Plate Voltage24000 V
Cathode Current0.45 mA
Audio Performance
Key Features
- Half-wave rectifier for TV receivers
- Parallel supply
- Anti-spraying (corona) ring support
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectification of line flyback pulses | 16000V | - | - | - | 0.15mA |
Application Notes
Filament voltage should be adjusted to 1.4V at 100 µA load. Voltage drop should not exceed 15% when current increases to 300-450 µA. Negative peak voltage spikes from flyback can reach 22% of Ua.
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