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17BUP4

Seventeen-inch direct-view television picture tube with electrostatic focusing, magnetic deflection, an aluminized screen, and external ion-trap system. Published operating data place typical anode voltage around 12 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: B6-63
Socket code: DUODECAL5
Base pins: 6
Nominal heater: 6.3 V / 600 mA

Description

17BUP4 — Direct-View Cathode-Ray Picture Tube

The 17BUP4 is a direct-view, rectangular glass cathode-ray picture tube designed for television receiver applications. It features electrostatic focusing, magnetic deflection, a unipotential cathode, a gray filter faceplate, and an external conductive coating. The tube is designed to operate with an external single-field ion trap magnet.

The 17BUP4 is electrically and mechanically identical to the 17CBP4, with the sole distinction being that the 17BUP4 features an aluminized screen to enhance brightness and picture definition.

Mechanical Specifications and Optical Characteristics

The 17BUP4 is constructed with a rectangular glass envelope. Its physical dimensions and screen area are specified as follows:

Dimension	Value
Overall Length	15 1/4 inches ± 3/8 inch
Greatest Bulb Diagonal	16 5/8 inches ± 1/8 inch
Greatest Bulb Width	15 3/8 inches ± 1/8 inch
Greatest Bulb Height	12 9/32 inches ± 1/8 inch
Minimum Useful Screen Diagonal	15 9/16 inches
Minimum Useful Screen Width	14 5/16 inches
Minimum Useful Screen Height	11 1/8 inches
Raster Size	14 5/16 inches x 11 1/8 inches

The faceplate is a gray filter glass with an approximate light transmission of 74% at the center. The screen utilizes a sulfide-type P-4 phosphor, which provides a white fluorescent and phosphorescent color with short persistence.

Deflection is achieved magnetically, with approximate deflection angles of:

Horizontal: 85°
Vertical: 68°
Diagonal: 90°

Electrical Connections and Basing

The tube utilizes a Small Shell Duodecal 6-Pin (B6-63) base with a 12L basing configuration. High-voltage connection to the anode (Grid No. 3 and Grid No. 5) is made via a Recessed Small Cavity Cap (J1-21). The bulb contact is aligned such that the J1-21 contact aligns with pin position #6 within a tolerance of ±30 degrees.

The pin connections, viewed from the bottom of the base, are:

Pin	Connection
Pin 1	Heater
Pin 2	Grid #1
Pin 6	Grid #4
Pin 10	Grid #2
Pin 11	Cathode
Pin 12	Heater
Anode Cap	Grid No. 3, Grid No. 5

The heater is rated for a nominal voltage of 6.3 V and a current of 0.6 A.

Interelectrode Capacitances

The approximate direct interelectrode capacitances of the 17BUP4 are:

Cathode to all other electrodes: 5 µµf
Grid #1 to all other electrodes: 6 µµf
External conductive coating to anode: Minimum 1200 µµf, Maximum 1500 µµf

Electrical Ratings and Operating Conditions

The maximum ratings of the 17BUP4 are established under the Design Center System. These limits must be respected to ensure reliable operation and tube longevity.

Absolute and Design-Maximum Ratings

Maximum DC Anode Voltage: 18,000 V
Maximum DC Grid #4 Voltage: -500 to +1000 V
Maximum DC Grid #2 Voltage: 500 V
Maximum Grid #1 Voltage:
- DC Negative-Bias Value: 125 V
- DC Positive-Bias Value: 0 V
- Positive-Peak Value: 0 V
Maximum Grid #1 Circuit Resistance: 1.5 MΩ
Maximum DC Peak Heater-Cathode Voltage:
- Heater negative with respect to cathode:
  - During warm-up period (not to exceed 15 seconds): 410 V
  - After equipment warm-up period: 180 V
- Heater positive with respect to cathode: 180 V

Typical Operating Conditions

Under typical operating conditions, the tube is configured with the following parameters:

DC Anode Voltage: 12,000 V (Note: Brilliance and definition decrease with decreasing anode voltage; the anode voltage should not be operated below 12,000 V)
DC Grid #4 Voltage: -50 to +350 V
DC Grid #2 Voltage: 300 V
DC Grid #1 Voltage: -28 to -72 V (for visual extinction of the focused raster)
DC Ion Trap Magnet Rated Strength: 32 Gausses (using an external single-field ion trap)

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B6-63
Socket code: DUODECAL5
Base pins: 6
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B6-63 - 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

X-ray radiationInterelectrode capacitances

Max plate voltage: 18000 V

Direct-view television CRT with electrostatic focus and magnetic deflection. P-4 white screen data and CRT electrode ratings are preserved in parameters; CRT maximum anode voltage is promoted to MaxPlateVoltage.

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.

Data set 01

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Nominal
Heater current
600 mA
Nominal
Anode voltage
18 V
Published CRT operating condition
Grid 2 voltage
300 V
Published CRT operating condition

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum DC grid 2 voltage
500 V
Maximum DC grid 4 voltage
-500 to 1000 V
Maximum grid 1 negative-bias voltage
125 V
NegativeBias
Maximum grid 1 positive-bias voltage
0 V
PositiveBias
Maximum grid 1 positive-peak voltage
0 V
PositivePeak
Peak heater-cathode voltage
410 V
HeaterNegativeWarmup
Peak heater-cathode voltage
180 V
HeaterNegativeAfterWarmup
Peak heater-cathode voltage
180 V
HeaterPositive
DC anode voltage
12000 V
TypicalOperation
DC grid 4 voltage
-50 to 350 V
TypicalOperation
DC grid 2 voltage
300 V
TypicalOperation
DC grid 1 voltage
-48 to -72 V
TypicalOperation
Ion trap magnet rated strength
32 gauss
Faceplate transmission at center
74 %
Approximate

Characteristic

Horizontal deflection angle
85 degrees
Approximate
Vertical deflection angle
68 degrees
Approximate
Diagonal deflection angle
90 degrees
Approximate

Capacitance

Cathode to all other electrodes capacitance
5 pF
Approximate
Grid 1 to all other electrodes capacitance
6 pF
Approximate
External conductive coating to anode capacitance
1500 pF
Maximum
External conductive coating to anode capacitance
1200 pF
Minimum