Specialized - Cathode Ray ·CathodeRay
Seventeen-inch magnetically focused and deflected cathode-ray display tube with approximately 65-degree horizontal and 50-degree vertical deflection. The available source does not clearly establish television, radar, or oscilloscope service, so its functional classification remains general.
The 17QCP1 is a high-resolution, magnetically focused and deflected cathode-ray tube (CRT) designed for display applications. It features an aluminized screen, a non-ion trap gun structure, and a low anode voltage design. The tube incorporates a P1 phosphor screen, which provides green fluorescence with medium persistence, and a faceplate with approximately 72% light transmission.
The 17QCP1 is constructed with a rectangular glass envelope and an aluminized screen to enhance brightness and prevent screen charging. It does not require an external ion trap magnet.
The physical envelope of the 17QCP1 is characterized by the following dimensions:
The minimum useful projected screen dimensions are:
The tube utilizes magnetic deflection and magnetic focusing. The deflection angles are:
The tube uses a B5-57 base with a 12N basing arrangement. High-voltage anode connection is made via a J1-21 bulb contact (recessed small cavity cap). The mechanical alignment of the bulb contact and pins is specified as follows:
The B5-57 base (12N basing) provides the following pin connections:
| Pin Number | Connection |
|---|---|
| Pin 1 | Heater |
| Pin 2 | Grid #1 (Control Grid) |
| Pin 10 | Grid #2 (Screen Grid) |
| Pin 11 | Cathode |
| Pin 12 | Heater |
| Recessed Cap (J1-21) | Anode |
The interelectrode capacitances of the 17QCP1 are:
The heater is designed for operation at a nominal voltage of 6.3 V with a current of 600 ± 10% mA.
The ratings for the 17QCP1 are established under the Design Maximum System. Operating the tube beyond these limits may impair performance or cause permanent damage.
| Parameter | Rating |
|---|---|
| Maximum Anode Voltage | 9,000 V |
| Minimum Anode Voltage | 5,000 V |
| Maximum Grid #2 Voltage | 500 V |
| Maximum Negative Grid #1 DC Voltage | 140 V |
| Maximum Negative Grid #1 Peak Voltage | 200 V |
| Maximum Positive Grid #1 DC Voltage | 0 V |
| Maximum Positive Grid #1 Peak Voltage | 2 V |
| Maximum Heater-Cathode Voltage (Heater negative to cathode) during warm-up (≤ 15 s) | 410 V |
| Maximum Heater-Cathode Voltage (Heater negative to cathode) after warm-up | 180 V |
For typical grid drive service, the operating parameters are defined as follows:
| Parameter | Typical Value |
|---|---|
| Anode Voltage | 5,000 V DC |
| Grid #2 Voltage | 300 V DC |
| Grid #1 Voltage (for visual cutoff) | -28 V to -72 V DC |
| Focusing Coil Current | 60 mA DC |
The focusing coil current of 60 mA DC is required under these typical conditions to achieve optimal spot focus across the screen. The grid #1 voltage range of -28 to -72 V DC represents the variation required to achieve visual cutoff of the raster.
The 17QCP1 is a magnetically focused and deflected cathode-ray tube featuring a 17-inch class rectangular envelope, a P1 green phosphor screen with medium persistence, and an aluminized backing. Operating under the Design Maximum System, it supports anode voltages between 5,000 V and 9,000 V, with typical grid drive operation specified at 5,000 V. The tube utilizes a B5-57 base (12N basing) and a J1-21 anode cap, with a 6.3 V, 600 mA heater.
Small-button Neoeightar 7-contact CRT base family
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Magnetically focused and deflected cathode-ray tube.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Focusing Method
Magnetic
Deflecting Method
Magnetic
Horizontal Deflection Angle
65 deg
Approximate
Vertical Deflection Angle
50 deg
Approximate
Anode Voltage Minimum
5000 to - V
Anode Voltage Typical
9000 V
Grid drive service
Grid 2 Voltage Typical
300 V
Grid drive service
Grid 1 Voltage
-72 to -28 V
Grid drive service