Specialized - Cathode Ray ·CathodeRay
3NP4
North American Philips 3NP4 magnetic-focus and magnetic-deflection projection television CRT with aluminized white P4 screen, 25 kV anode rating and 6.3 V 0.6 A heater.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 5
- Nominal heater
- 6.3 V / 600 mA
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 5
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Cathode Ray
- Max plate voltage
- 25000 V
JETEC 1949 3NP4 magnetic-focus/magnetic-deflection projection CRT, aluminized white P4 screen. Maximum anode HV 25000 V DC, grid negative bias magnitude 125 V, grid positive DC 0 V and peak +2 V; heater-negative-to-cathode peak 175 V, heater-positive max 10 V; grid resistor max 1.5 MΩ. Typical anode 24000 V, grid cutoff -36 to -84 V, focus coil current ~120 mA, spot offset max 3 mm. Cathode-to-all capacitance 8 pF, grid-to-all 14 pF, external coating-to-anode 275–375 pF. Magnetic deflection ~42°, five-contact base with J1-22 recessed ball anode contact. 6.3 V 0.6 A heater.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.