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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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NL-649 vacuum tube outline illustration

Tube-number record

NL-649

0 archive entries

NL-649 is a tube type in the TubeDatabase archive (class: Rectifier Tube). Recorded specifications: brand National Electronics, construction Mercury Vapor, socket 4-pin, and maximum plate voltage 900 V. The archive does not yet hold a photographed example of this type.

BrandNational Electronics
ClassRectifier Tube
Base4-pin

Construction

Primary TypeMercury Vapor
Rectifier TypeHalf-wave
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialMercury filled
Warm-up Time20s

Absolute Maximum Ratings

Application Notes

Designed especially for industrial power rectifier applications and for 'back-rectifier' applications in conjunction with a thyratron tube.

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    Plate Voltage900 V
    Cathode Current2000 mA

    Audio Performance

    Key Features
    • Sturdy
    • Single-ended
    • Industrial power rectifier
    • Mercury filled