Tube-number record
50A1
0 archive entries
50A1 is a tube type in the TubeDatabase archive (class: Ballast Tube). Recorded specifications: brand Sylvania, year 1953, construction Other / special, socket Noval (B9A), and maximum plate voltage 65 V. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassBallast Tube
BaseNoval (B9A)
Construction
Primary TypeOther / special
EnvelopeT-6 1/2
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage65 V
Cathode Current58 mA
Audio Performance
Key Features
- Gas-filled ballast tube
- Maintains relatively constant current
- Radiation cooling
- Miniature 9-pin base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Operating Point 1 | 30 V | — | — | — | 52 mA |
| Average Operating Point 2 | 50 V | — | — | — | 54 mA |
| Average Operating Point 3 | 65 V | — | — | — | 56 mA |
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