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Tube Database (1,270 tubes)

Other (3257), Pre (2314), Power (1030), Rectifier (740)
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NL-5558/FG-32

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BrandNational Electronics
ClassMercury Vapor Rectifier
Base4-pin
Filament5V @ 4.5mA

Construction

Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeGlass
Sections1

Filament / Heater

Warm-up Time300s
Heater NotesIndirectly heated cathode

Absolute Maximum Ratings

Plate Voltage5000 V
Cathode Current2500 mA

Audio Performance

Key Features
  • Mercury filled
  • Industrial power applications
  • Sturdy construction
  • High inverse voltage capability

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Arc Drop12V---10000mA

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