Specialized - Cathode Ray ·CathodeRay
Direct-view television picture tube with aluminized screen and magnetic deflection. Designed for high-voltage monochrome television display service, it typically operates near 12 kV at the anode and uses a 6.3 V, 0.45 A heater.
An indirectly heated, electrostatic-focus, magnetic-deflection cathode ray tube featuring a 13-inch screen, a 110-degree diagonal deflection angle, and a short neck design. The tube is engineered specifically for cathode drive applications.
The 13AP4 is a specialized cathode ray tube (CRT) featuring a 13-inch screen with a filled rim and a short 4 1/4-inch neck. It utilizes a straight electron gun design that operates without the need for an external ion trap. The tube is designed for cathode drive service, operating with a nominal 6.3-volt, 450-milliampere heater and a 50-volt Grid No. 2 configuration. Focusing is achieved electrostatically, while beam deflection is handled magnetically.
The physical construction of the 13AP4 incorporates a J-101-A1 glass bulb, a J1-21 small cavity cap bulb contact, and a B7-208 small button Neoeightar 7-pin base. The basing configuration is designated as 8HR.
To prevent mechanical stress on the tube, the socket for the B7-208 base must not be rigidly mounted. It should feature flexible leads and be allowed to move freely so that the circuit wiring cannot impress lateral strains through the socket contacts onto the base pins. The bottom circumference of the base wafer is designed to fall within a 1 3/4-inch diameter circle concentric with the bulb axis.
The external conductive coating of the tube must be grounded. When cleaning the coating area, only a soft, dry, lint-less cloth should be used.
All voltage values, unless otherwise specified, are positive and measured with respect to Grid No. 1. The tube is rated under the Design Maximum System.
Under typical operating conditions, the voltages are configured as follows (measured positive with respect to Grid No. 1):
While the typical Grid No. 4 focusing voltage is listed as 250 V DC, individual tubes will exhibit satisfactory focus at some value between 0 and +400 V. This typical focus rating is specified with the combined Grid No. 4 bias voltage and video signal voltage adjusted to provide an anode current of 100 microamperes on a 10 1/2" by 8" pattern (using an RCA 2F21 monoscope or equivalent).
The 13AP4 uses the JEDEC 8HR basing arrangement. The J1-21 ultor contact aligns with Pin Position No. 4 with an angular tolerance of ± 30 degrees, and is located on the same side of the tube as Pin No. 4.
| Pin Number | Connection |
|---|---|
| Pin 1 | Heater |
| Pin 2 | Grid No. 1 |
| Pin 3 | Grid No. 2 |
| Pin 4 | Grid No. 4 |
| Pin 5 | No Connection |
| Pin 6 | Grid No. 1 |
| Pin 7 | Cathode |
| Pin 8 | Heater |
| Cap | Ultor (CL-G3-G5) |
Neoeightar 8-contact
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
CRT anode/ultor voltage is represented in MaxPlateVoltage; additional electrode, drive, optical, and capacitance data retained as parameters.
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.
Minimum anode voltage
8000 V
Maximum anode voltage
15000 V
Minimum anode voltage
8000 V
Typical anode voltage
12000 V
Maximum grid No. 2 voltage
60 V
Maximum heater voltage
6.9 V
Minimum heater voltage
5.8 V
Heater warm-up time
1 s
Grid No. 1 to other electrodes capacitance
6 pF
Cathode to other electrodes capacitance
5 pF