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27XP4

Twenty-seven-inch short-neck television CRT with electrostatic focusing, 90-degree magnetic deflection, gray-filter faceplate, aluminized P4 screen, and no ion trap. It is designed for shallow direct-view monochrome receivers.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12L
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Twenty-seven-inch short-neck television CRT with electrostatic focus, 90-degree magnetic deflection, gray-filter faceplate, aluminized P4 screen, and no ion trap.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12L
Socket code: B12A
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12L - 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: 16 V
Max screen voltage: 550 V

Electrical section extracted from supplied datasheet.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum Anode Voltage . 23000 Volts dc
23000 V
Maximum Anode Voltage . 23000 Volts dc
Maximum Grid No. 2 Voltage. . 550 Volts dc A Division of
550 V
Maximum Grid No. 2 Voltage. . 550 Volts dc A Division of
Maximum Anode Voltage . 23,000 Volts dc
23 V
Maximum Anode Voltage . 23,000 Volts dc
Maximum Grid No. 2 Voltage 700 Volts dc
700 V
Maximum Grid No. 2 Voltage 700 Volts dc
at close range if this tube is operated at higher than the manufacturer's Maximum Rated Anode Voltag
16 V
at close range if this tube is operated at higher than the manufacturer's Maximum Rated Anode Voltage or 16,000 volts,

Characteristic

Minimum Anode Voltage . . 11,000 Volts dc
11 V
Minimum Anode Voltage . . 11,000 Volts dc
Grid No. 4 Voltage (Focusing 'Electrode) —550 to + 1100 Volts dc ELECTRONIC TUBES
1100 V
Grid No. 4 Voltage (Focusing 'Electrode) —550 to + 1100 Volts dc ELECTRONIC TUBES
Minimum Grid No. 2 Voltage . 200 Volts dc Sylvania Electric Produces Inc.
200 V
Minimum Grid No. 2 Voltage . 200 Volts dc Sylvania Electric Produces Inc.
Grid No. 1 Voltage
1 V
Grid No. 1 Voltage
Minimum Anode Voltage . . 11,000 Volts dc
11 V
Minimum Anode Voltage . . 11,000 Volts dc
Grid No. 4 Voltage (Focusing Electrode) —400 to + 1250 Volts de
1250 V
Grid No. 4 Voltage (Focusing Electrode) —400 to + 1250 Volts de
Minimum Grid No. 2 Voltage. 350 Volts dc
350 V
Minimum Grid No. 2 Voltage. 350 Volts dc
Anode Voltage. . 18,000 Volts de
18 V
Anode Voltage. . 18,000 Volts de
Grid No. 4 Voltage for Focus 0 to 400 Volts dc
400 V
Grid No. 4 Voltage for Focus 0 to 400 Volts dc
Grid No. 2 Voltage . . 400 Volts dc
400 V
Grid No. 2 Voltage . . 400 Volts dc
Grid No. 1 Voltage Requxred for Cutoffs. -36to-94 Volts de
-94 V
Grid No. 1 Voltage Requxred for Cutoffs. -36to-94 Volts de
Anode Voltage. . 18,000 Volts de
18 V
Anode Voltage. . 18,000 Volts de
Grid No. 4 Voltage for Focus. 010400 Volts dc
10400 V
Grid No. 4 Voltage for Focus. 010400 Volts dc
Grid No. 2 Voltage . 400 Volts dc
400 V
Grid No. 2 Voltage . 400 Volts dc
Cathode Voltage Required for Cutoffs. +36to +78 Volts de
78 V
Cathode Voltage Required for Cutoffs. +36to +78 Volts de

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Heater current
600 mA
Published heater current
Light Transmittance ( Approx. ) •
70 %
Light Transmittance ( Approx. ) •.... 70Percent No Ion Trap
Heater voltage
6.3 V
Heater voltage .......... 6.3 Volts
Heater warm-up Timel
11 s
Heater warm-up Timel ...... 11 Seconds

Other

Minimum Anode voltage
11000 V
Minimum Anode voltage ..... • . 11,000Volts
Grid No. 4 Voltage ( Focusing Electrode) -550 to +
1100 V
Grid No. 4 Voltage ( Focusing Electrode) -550 to + 1100 Volts dc ELECThoNIC TUBES 1I
Maximum Grid No. 2 Voltage
550 V
Maximum Grid No. 2 Voltage .... 550 Volts dc A Divisioo of I
Minimum Grid No. 2 Voltage
200 V
Minimum Grid No. 2 Voltage .... 200 Volts dc Sylvania Electric Products Inc. I
Warm-up Period not to Exceed
15 s
Warm-up Period not to Exceed 15 Seconds . . 450 Volts PACE 1 0F 3
After Equipment warm-up period
200 V
After Equipment warm-up period ..... 200 Volts File Under I
Heater positive with Respect to cathode
200 V
Heater positive with Respect to cathode ..... 200 Volts TELEVISION PIC'IURE TUBES i
Maximum Anode voltage
23000 V
Maximum Anode voltage .......... 23,000 Volts
Grid No. 4 Voltage ( Focusing Electrode)
1250 V
Grid No. 4 Voltage ( Focusing Electrode) ..... 400 to + 1250 Volts
Maximum Grid No. 2 Voltage
700 V
Maximum Grid No. 2 Voltage ........ 700 Volts
Minimum Grid No. 2 Voltage
350 V
Minimum Grid No. 2 Voltage ......... 350 Volts
Anode voltage
18000 V
Anode voltage .............. 18,000 Volts
Grid No. 4 Voltage for Focus
400 V
Grid No. 4 Voltage for Focus ......... 0 to 400 Volts
Grid No. 2 Voltage
400 V
Grid No. 2 Voltage ............ 400 Volts
Grid No. 1 Voltage Required for cutoff 5
-94 V
Grid No. 1 Voltage Required for cutoff 5 ..... -36 to -94 Volts
Cathode voltage Required for cutoff 5
78 V
Cathode voltage Required for cutoff 5 ...... +36 to +78 Volts

CircuitValue

Grid No. 1 Circuit Resistance
1.5 Mohm
Grid No. 1 Circuit Resistance . 1.5 Megohms Max.
dt clo]e range Of tbil taebe il oper¢led at bigber iban the man%facturer'I Maximttm Rated Anode Voltage or
16000 V
dt clo]e range Of tbil taebe il oper¢led at bigber iban the man%facturer'I Maximttm Rated Anode Voltage or 16,000 Volts,