Tube-number record
40A1
0 archive entries
40A1 is a tube type in the TubeDatabase archive (class: Ballast Tube). Recorded specifications: brand SYLVANIA, construction Other / special, 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
SectionsSingle
Filament / Heater
MaterialIron
Absolute Maximum Ratings
Plate Voltage60 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Avg Operating Current @ 20V | 20 V | — | — | — | 74 mA |
| Avg Operating Current @ 40V | 40 V | — | — | — | 84 mA |
| Avg Operating Current @ 60V | 60 V | — | — | — |
Application Notes
The type 40A1 is used as the cathode resistor of the horizontal output tube in receivers specifically designed for its use. It stabilizes anode voltage and picture width against line voltage variations.
Datasheets
Datasheet: 40A1.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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