Specialized - Cathode Ray ·CathodeRay
15EP4
Electronic Tubes Ltd. 15EP4 15-inch monochrome television CRT with magnetic focus and deflection, white screen, ion trap and 6.3 V 0.3 A heater.
- Sections
- 1
- Base
- B12A
- Socket code
- -
- Base pins
- 12
- Nominal heater
- 6.3 V / 300 mA
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- B12A
- Socket code
- -
- Base pins
- 12
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
B12A - 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
- 10000 V
15EP4 CRT: maximum anode2 HV 10000 V; anode1 max 0.038×Va2 (380 V at Va2=10000 V), not an unconditional screen-grid rating. Max mean cathode current 275 µA; heater-negative-to-cathode peak max 150 V. Grid minimum -1 V, visual cutoff grid limit -0.24×Va1, grid resistor max 1 MΩ. Typical Va2 9000 V, Va1 250 V, grid drive 30 V for peak brightness, cathode current at peak brightness 275 µA, focusing field 280 gauss. White screen, magnetic focus/deflection ~52°, ion trap. Grid capacitance 6.5 pF, cathode capacitance 5.5 pF, coating-to-anode2 500–2000 pF. Heater switching surge <=8.5 V.
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.