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

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

NL-649

0 archive entries

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

Plate Voltage900 V
Cathode Current2000 mA

Audio Performance

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

Application Notes

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

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