Tube-number record
6508
0 archive entries
6508 is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand Amperex, construction Diode, base Metallic shell, socket 4-pin, and maximum plate voltage 21000 V. The archive does not yet hold a photographed example of this type.
BrandAmperex
ClassRectifier
Base4-pin
Construction
Primary TypeDiode
Rectifier TypeMercury Vapor
EnvelopeGlass with top bakelite cap
Base MaterialMetallic shell
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage21000 V
Cathode Current2500 mA
Audio Performance
Key Features
- Directly heated
- Mercury-vapor rectifier
- Top bakelite cup to prevent mercury condensation on anode
- Convection cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Tube Voltage Drop | 12 V | — | — | — | 2500 mA |
Application Notes
Filament voltage phase shift of 90° ± 30° with respect to plate voltage recommended for maximum life. Tube should always be used with the bakelite cap attached. Filament must be pre-heated (60s) before applying plate voltage.
Datasheets
Datasheet: 6508.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
0 results