Specialized - Cathode Ray ·CathodeRay
12WP4
Lansdale 12WP4 12-inch monochrome television CRT with magnetic focus and deflection, triode ion-trap gun, gray-tinted P4 white screen and 6.3 V 0.6 A heater.
- Sections
- 1
- Base
- E9-1
- Socket code
- -
- Base pins
- 9
- 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
- E9-1
- Socket code
- -
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
E9-1 - 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
- 12000 V
Lansdale 12WP4 CRT. Maximum anode 12000 V DC, grid1 negative bias -125 V DC, positive bias 0 V, positive peak +2 V. Heater-cathode ±140 V normally; heater-negative 410 V permitted during warm-up <=15 s. Typical anode 10000 V, grid1 cutoff -27 to -63 V, permanent-magnet focus field 240 gauss, single-field ion trap 95 gauss. Grid1 circuit resistance max 1.5 MΩ. P4 white medium-persistence gray tinted screen, magnetic focus/deflection 55°. Capacitances cathode-to-other 3.22 pF, grid1-to-other 3.19 pF, external coating-to-anode 750–2000 pF. Separate anode bulb contact.
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.