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

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Tube-number record

3FP7-A

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BrandRCA
ClassCathode-Ray Tube
BaseCRT base (B12 family)
Filament6.3 V @ 0.6 mA

Construction

Primary TypeElectrostatic Focus and Deflection
EnvelopeGlass
Base MaterialPlastic
SectionsSingle gun

Filament / Heater

Heater NotesUnipotential Cathode

Absolute Maximum Ratings

Plate Voltage4400 V
Grid 2 Voltage2200 V
Grid 1 Voltage-200 V
H-C Voltage125 V

Audio Performance

Key Features
  • Electrostatic Focus
  • Electrostatic Deflection
  • Long-persistence phosphorescence
  • Improved electron gun
  • Supplements RCA-3FP7

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Low Accelerating Voltage2000 V————
High Definition Scan3000 V————
High Brightness4000 V————

Application Notes

Recommended for oscillographic applications where long persistence is required. The yellow pattern remains visible for several minutes. Use Wratten No. 15 filter to isolate yellow persistence or Wratten No. 47A for blue short-persistence.

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