Specialized - Cathode Ray ·CathodeRay
12FP7
12FP7 12-inch P7 phosphor cathode-ray tube with electrostatic focusing and two-axis electrostatic deflection, 6.3 V 0.6 A heater.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 12
- 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
- 12
- 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
- 8800 V
- Max screen voltage
- 2200 V
12FP7 electrostatically focused and deflected CRT. Maximum anode3 supplementary HV electrode 8800 V; anode2 4400 V; anode1 focus 2200 V; grid2 accelerator 2200 V; grid1 never positive. Peak voltage between anode2 and any deflection electrode max 1100 V. Heater negative relative cathode DC max 125 V. Typical configurations: A3 4000/4000/6000/8000 V, A2 2000/4000/3000/4000 V, A1 625/1250/937/1250 V, grid2 2000 V, grid1 cutoff -60 V. Deflection plate pairs D1/D2 and D3/D4; max capacitances cathode-to-other 10 pF, grid1-to-other 10 pF, each deflection pair 5 pF. Grid circuit resistance max 1.5 MΩ, deflection supply impedance at heater frequency max 1 MΩ. P7 phosphor, 12-inch bulb.
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.