Tube-number record
1749A
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BrandPhilips
ClassRectifier
Construction
Primary TypeOther / special
Rectifier TypeFull-wave
EnvelopeGlass
Sections2
Filament / Heater
Materialoxide-coated
Warm-up Time120s
Absolute Maximum Ratings
Plate Voltage300 V
Cathode Current25000 mA
Audio Performance
Key Features
- Double-anode
- Mercury vapour and gas filled
- Directly heated
- Oxide-coated filament
- Industrial cinema rectifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Characteristic | 10 V | — | — | — | 12500 mA |
Application Notes
Specifically designed for cinema rectifiers (25 A per valve, max. 36 Pb-cells). The screen (s) must be connected to the cathode via a resistor. Recommended warm-up time is 2 minutes, but can be reduced to 1 minute if urgent. Following transport or long service interruptions, a 5-minute warm-up is required.
Datasheets
Datasheet: 1749A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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