866A

866A has no equivalent designation confirmed by the archive.

Construction

The 866A is a half-wave mercury-vapor rectifier. It has a coated, shielded ribbon filament that is edgewise-wound. The filament is rated at 2.5 volts and 5.0 amperes, with the voltage measured at the filament pins. The tube has a Medium 4-pin bayonet base (RM/A4-10), a maximum overall length of 6.5 inches, and a maximum overall diameter of 2.5 inches.

Ratings and Operating Conditions

The tube voltage drop is approximately 15 volts. The filament voltage should be kept within the range of 2.38 to 2.63 volts. The 866A must be mounted vertically, base down. The condensed-mercury temperature range is 25–70 °C for peak inverse anode voltages of 2000 and 5000 volts, and 25–60 °C for 10000 volts; operation at 40 °C ± 5 °C is recommended.

Peak inverse anode voltage ratings are 2000, 5000, or 10000 volts maximum. Corresponding maximum peak anode current ratings are 2.0 amperes at 2000 volts, 1.0 ampere at 5000 volts, and 0.1 ampere at 10000 volts. Maximum average anode current ratings are 0.5 amperes at 2000 volts peak inverse, and 0.25 amperes at 5000 and 10000 volts. Maximum supply frequency ratings are 150 c.p.s. at 2000 volts peak inverse, 1000 c.p.s. at 5000 volts, and 150 c.p.s. at 10000 volts.

Original manufacturer datasheets for 866A, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• MAXIMUM RATINGS (single tube)