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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-643

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BrandNational Electronics, Inc.
ClassRectifier Tube
BaseSpecial / none

Construction

Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeGlass

Filament / Heater

Warm-up Time120s

Absolute Maximum Ratings

Plate Voltage700 V
Cathode Current15000 mA

Audio Performance

Key Features
  • Mercury filled for efficiency
  • Designed for industrial power rectifier applications
  • Ability to withstand high inverse voltage
  • Sturdy construction

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