Specialized - Cathode Ray ·CathodeRay
14KP4A
Electronic Tubes Ltd. 14KP4A 14-inch gray-face monochrome television CRT with magnetic focus and 70-degree deflection, 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
- 14000 V
14KP4A CRT: maximum anode2 HV 14000 V; anode1 focusing electrode 200–410 V (not a screen-grid rating). Grid minimum -1 V; grid voltage at visual cutoff conditional -0.24×anode1 voltage. Peak heater-negative-to-cathode maximum 150 V. Typical anode2 12000 V, anode1 250 V, grid drive for peak brightness 30 V, peak cathode current 195 µA. Grid resistor max 1 MΩ. White phosphor gray-face (~66% transmission), magnetic focus/deflection 70° diagonal, ion trap. Capacitances grid-to-all 6.5 pF, cathode-to-all 5.5 pF, anode2-to-coating 1200 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.