Specialized - Cathode Ray ·CathodeRay
12DP7B
RCA 12DP7B 12-inch oscillograph cathode-ray tube with magnetic focusing and deflection, P7 dual-persistence phosphor and 6.3 V 0.6 A heater.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 8
- 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
- 8
- 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
- 10000 V
- Max screen voltage
- 700 V
12DP7B RCA 1952 oscillograph CRT. Ultor (grid3+collector) max 10000 V; grid2 max +700 V or -180 V; grid1 negative bias max -180 V, positive peak +2 V, peak grid1 drive from cutoff max 65 V; heater-cathode ±125 V; grid1 resistance max 1.5 MΩ. Typical ultor 4000 or 7000 V, grid2 250 V, grid1 visual cutoff -25 to -70 V. Focus-coil current 88.5 mA at 4000 V or 117 mA at 7000 V, ±15%. Limit ultor input power to 6 W near maximum rating (not a general plate dissipation rating). P7 short blue fluorescence/long greenish-yellow phosphorescence, filterglass faceplate, magnetic focus/deflection ~50°. Capacitances grid1 9 pF, cathode 6 pF.
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.