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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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ML-857B vacuum tube outline illustration

Tube-number record

ML-857B

0 archive entries

ML-857B is a tube type in the TubeDatabase archive (class: Mercury-Vapor Rectifier). Recorded specifications: brand Machlett, year 1961, construction Mercury Vapor, base Metal, socket Special / none, and maximum plate voltage 22000 V. The archive does not yet hold a photographed example of this type.

BrandMachlett
ClassMercury-Vapor Rectifier
BaseSpecial / none

Construction

Primary TypeMercury Vapor
Rectifier TypeHalf-wave
EnvelopeGlass
Base MaterialMetal
SectionsSingle

Filament / Heater

Warm-up Time60s

Absolute Maximum Ratings

Application Notes

Designed for use as a half-wave rectifier in high-power radio-transmitting and r.f. heating equipment. Tube life will be increased when quadrature filament excitation is used.

Filters

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Manufacturers

Brands

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    Plate Voltage22000 V
    Cathode Current10000 mA

    Audio Performance

    Key Features
    • Low internal voltage drop
    • Cathode design permitting in-phase or quadrature filament excitation
    • Two-electrode mercury-vapor design