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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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Tube-number record

21XP4B

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BrandRCA
ClassPicture Tube
BaseDuodecal
Filament6.3 V @ 600 mA

Construction

Primary TypeDisplay / CRT
EnvelopeGlass
Sections1

Filament / Heater

Heater Notes600 +/- 30 mA

Absolute Maximum Ratings

Plate Voltage20000 V
Grid 2 Voltage550 V
Grid 1 Voltage-155 V
H-C Voltage200 V

Audio Performance

Key Features
  • Low-voltage electrostatic focus
  • No ion-trap magnet required
  • Aluminized phosphor
  • Filterglass faceplate

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Grid-Drive Service16000 V————

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