Tube-number record
40B2
0 archive entries
40B2 is a tube type in the TubeDatabase archive (class: Ballast Tube). Recorded specifications: brand Sylvania, construction Other / special, base Intermediate Shell Octal 5-Pin, socket Octal, and maximum plate voltage 60 V. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassBallast Tube
BaseOctal
Construction
Primary TypeOther / special
EnvelopeT-9
Base MaterialIntermediate Shell Octal 5-Pin
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage60 V
Cathode Current160 mA
Audio Performance
Key Features
- Gas-filled
- Maintains relatively constant current over specified voltage range
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operating Characteristic 1 | 20 V | — | — | — | 140 mA |
| Operating Characteristic 2 | 40 V | — | — | — | 150 mA |
| Operating Characteristic 3 | 60 V | — | — | — | 155 mA |
Datasheets
Datasheet: 40B2.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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