Tube-number record
3FP7-A
0 archive entries
3FP7-A is a tube type in the TubeDatabase archive (class: Cathode-Ray Tube). Recorded specifications: brand RCA, construction Electrostatic Focus and Deflection, base Plastic, socket CRT base (B12 family), and maximum plate voltage 4400 V. The archive does not yet hold a photographed example of this type.
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Low Accelerating Voltage | 2000 V | — | — | — | — |
| High Definition Scan | 3000 V | — | — | — | — |
| High Brightness | 4000 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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