Tube-number record
255A
0 archive entries
255A is a tube type in the TubeDatabase archive (class: Mercury vapor rectifier). Recorded specifications: brand Western Electric, construction Rectifier, base Metal supporting collar, socket Special / none, and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.
BrandWestern Electric
ClassMercury vapor rectifier
BaseSpecial / none
Construction
Primary TypeRectifier
Rectifier TypeMercury vapor
EnvelopeGlass bulb
Base MaterialMetal supporting collar
SectionsSingle
Filament / Heater
MaterialThermionic
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Conducting (Anode-Cathode Drop) | 10 V | — | — | — | 5000 mA |
Application Notes
The tube must be mounted vertically with the filament terminal end down. A 15-minute warmup is required if the tube has been reinserted to condense mercury. Normal filament warmup time is 2 minutes before anode potential is applied. Anode-cathode drop increases over the life of the tube.
Datasheets
Datasheet: 255A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
0 results