Specialized - Cathode Ray ·CathodeRay
High-voltage P4 cathode-ray picture-display tube using magnetic deflection, with manufacturer data supporting wide-angle scanning and typical anode operation in the 12–14 kV range.
An aluminized, rectangular glass cathode-ray tube featuring low-voltage electrostatic focus, magnetic deflection, and a unipotential cathode for television receiver applications.
The 17VP4B is a direct-view picture tube designed specifically for television display systems. It features a rectangular glass envelope, a cylindrical faceplate, and a unipotential cathode. The tube utilizes low-voltage electrostatic focusing and magnetic deflection, with a horizontal deflection angle of 66° and a diagonal deflection angle of 70°.
The 17VP4B is identical to the 17VP4 except for the inclusion of an aluminized screen, which improves light output and picture contrast. The tube's construction incorporates a neutral density faceplate, an external conductive coating, and an external single-field ion trap.
The 17VP4B is built with a rectangular glass bulb and a cylindrical faceplate. The screen is coated with Phosphor No. 4 (sulfide type), which produces a white fluorescent and phosphorescent display with short persistence. The neutral density faceplate provides a light transmission of 58% to 72% at the center of the screen.
The physical envelope of the tube has the following dimensions:
An external conductive coating is applied to the envelope, forming a capacitor with the internal anode. This capacitance ranges from a minimum of 750 μμf to a maximum of 1500 μμf.
The 17VP4B is equipped with a small shell duodecal 6-pin base (B6-63) and uses the 12L basing configuration. The high-voltage connection to the anode is made via a recessed small cavity cap (J1-21) located on the bulb. This bulb contact is aligned with pin position #6 within a tolerance of ±30 degrees.
The tube's heater is designed for parallel or series AC/DC operation with the following nominal ratings:
The electrical connections to the base pins and anode cap are assigned as follows:
| Pin / Cap | Electrode Connection |
|---|---|
| Pin 1 | Heater |
| Pin 2 | Grid No. 1 |
| Pin 6 | Grid No. 4 (Focusing Electrode) |
| Pin 10 | Grid No. 2 |
| Pin 11 | Cathode |
| Pin 12 | Heater |
| Anode Cap | Grid No. 3 / Anode No. 2 |
The approximate capacitances between the electrodes are:
The 17VP4B operates under specified design-center maximum ratings and typical operating conditions.
These ratings represent the limits within which the tube must be operated to ensure reliable performance and prevent damage:
For standard television receiver service, the typical operating parameters are:
The 17VP4B is a rectangular, direct-view television picture tube utilizing low-voltage electrostatic focus and magnetic deflection (66° horizontal, 70° diagonal). It is distinguished from the standard 17VP4 by its aluminized screen, which provides enhanced brightness and contrast. Operating at a typical anode voltage of 12,000 Volts, the tube features a unipotential cathode, a 6.3 V / 0.6 A heater, and a small shell duodecal 6-pin base. Its optical performance is characterized by a white-emitting Phosphor No. 4 with short persistence, housed behind a neutral density cylindrical faceplate. Proper operation requires the use of an external single-field ion trap adjusted to approximately 35 Gausses.
Small-shell Duodecal 5-contact CRT base
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-specific electrode/focus/deflection data retained as parameter rows.
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.
Maximum Anode Voltage
18000 V
Typical Anode Voltage
14000 V
Maximum Grid2 Voltage
500 V
Typical Grid2 Voltage
300 V
FocusingMethod
Magnetic
DeflectingMethod
Magnetic
DeflectionAngleApproximate
90 degree
PhosphorNumber
4
FluorescentColor
White
Variant
Published faceplate/screen variant on shared datasheet
Data set 02
Published operating points and test conditions from this source.
FACEPLATE LIGHT TRANSMISSION AT CENTER (gPPROX.) — value 1
58 percent
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
FACEPLATE LIGHT TRANSMISSION AT CENTER (gPPROX.) — value 2
72 percent
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
HEATER VOLTAGE
6.3 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
HEATER POSITIVE WITH RESPECT TO CATHODE
1 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MA%IMUM GRID MI CIRCUIT RESISTANCE
1.5 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
PATTERN wITN THE BL ACNS JUST BL AC N, TO GIVE AN AVERAGE BEAM CURRENT OF 100 NICPO AMPERES ON A
100
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC ANODE N2„ GRID N} VOLTAGE
12 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
OC ANODE Ni VOLTAGE (FOCUSING ELECTRODE)
260 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC GRID M2 VOLTAGE
3 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC ION TRAP CURRENT STANDARD COIL 8111 — value 1
8111 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC ION TRAP CURRENT STANDARD COIL 8111 — value 2
75 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
ION TRAP FIELD INTENSITY (APPROX.)D
35
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM ANODE 81 VOLTAGE RANGE FOR FOCUS B — value 1
81 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM ANODE 81 VOLTAGE RANGE FOR FOCUS B — value 2
-64 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM ANODE 81 VOLTAGE RANGE FOR FOCUS B — value 3
350 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC GRID N2 VOLTAGE
5 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC ANODE #i VOLTAGE
-5 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC ANODE IM1 CURRENT RANGE — value 1
-15 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC ANODE IM1 CURRENT RANGE — value 2
25 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.