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Power - TV Vertical Output ·BeamPower-Triode

25JZ8

Combination triode and beam-power tube for television vertical-deflection oscillator and amplifier applications, electrically tied to its 6-volt parent except for heater characteristics and ratings.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
12OZ
Socket code
B12C
Base pins
12
Nominal heater
25.2 V / 300 mA

Description

Combined triode and beam-power tube for television vertical-deflection oscillator and amplifier applications.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12OZ
Socket code
B12C
Base pins
12
Nominal heater voltage
25.2 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12OZ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8500 Ω
Transconductance
0.00235 S
Amplification factor
20
Max plate voltage
250 V
Max plate dissipation
1 W
Max cathode current
70 mA

Reference/equivalence-only sparse-source exception; medium-mu triode ratings/characteristics not reproduced.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
11700 Ω
Transconductance
0.0071 S
Max plate voltage
250 V
Max screen voltage
200 V
Max plate dissipation
7 W
Max screen dissipation
1.8 W
Max cathode current
245 mA

Reference/equivalence-only sparse-source exception; beam-pentode ratings/characteristics not reproduced.

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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Warm-up Time

    11 s

    Other;PublishedValue1

  • Heater Warm-up Time

    11 s

    Other;PublishedValue2

  • Heater Warm-up Time

    11 s

    Other;PublishedValue3

  • Peak value t2

    0 V

    Other;PublishedValue1

  • Peak value t2

    200 V

    Other;PublishedValue2

  • Peak value t2

    200 V

    Other;PublishedValue3

  • Peak value t2

    200 V

    Other;PublishedValue4

  • Average value

    100 V

    Other;PublishedValue1

  • Average value

    100 V

    Other;PublishedValue2

  • Average value

    100 V

    Other;PublishedValue3

  • Average value

    100 V

    Other;PublishedValue4

  • DC Plate Voltage

    250 V

    MaximumRating;PublishedValue1

  • DC Plate Voltage

    250 V

    MaximumRating;PublishedValue2

  • Peak Positive-Pulse Plate Voltage* —

    2000 V

    MaximumRating

  • Peak Negative-Pulse Grid-No.l Voltage

    200 V

    MaximumRating

  • Published value

    400 V

    MaximumRating;PublishedValue1

  • Published value

    150 V

    MaximumRating;PublishedValue2

  • Average Cathode Current

    70 mA

    MaximumRating;PublishedValue1

  • Average Cathode Current

    245 mA

    MaximumRating;PublishedValue2

  • Plate Dissipation*

    20 mA

    MaximumRating;PublishedValue1

  • Plate Dissipation*

    70 mA

    MaximumRating;PublishedValue2

  • Published value

    1 W

    MaximumRating;PublishedValue1

  • Published value

    7 W

    MaximumRating;PublishedValue2

  • Grid-No

    2 W

    MaximumRating;PublishedValue1

  • Grid-No

    1.8 W

    MaximumRating;PublishedValue2

  • For fixed-bias operation

    1 megohm

    MaximumCircuitValue;PublishedValue1

  • For fixed-bias operation

    1 megohm

    MaximumCircuitValue;PublishedValue2

  • For cathode-bias operation

    2.2 megohm

    MaximumCircuitValue;PublishedValue1

  • For cathode-bias operation

    2.2 megohm

    MaximumCircuitValue;PublishedValue2

  • Maximum Plate Voltage

    250 V

    Section1;Promoted

  • Maximum Plate Dissipation

    1 W

    Section1;Promoted

  • Maximum Cathode Current

    70 mA

    Section1;Promoted

Characteristic

  • Plate Voltage

    150 V

    Characteristic;PublishedValue1

  • Plate Voltage

    45 V

    Characteristic;PublishedValue2

  • Plate Voltage

    120 V

    Characteristic;PublishedValue3

  • Grid-No

    2 V

    Characteristic;PublishedValue1

  • Grid-No

    110 V

    Characteristic;PublishedValue2

  • Grid-No

    110 V

    Characteristic;PublishedValue3

  • Grid-No.l (Control-Grid) Voltage

    -6 V

    Characteristic;PublishedValue1

  • Grid-No.l (Control-Grid) Voltage

    0 V

    Characteristic;PublishedValue2

  • Grid-No.l (Control-Grid) Voltage

    -8 V

    Characteristic;PublishedValue3

  • Plate Resistance (Approx.)

    8500 ohm

    Characteristic;PublishedValue1

  • Plate Resistance (Approx.)

    11700 ohm

    Characteristic;PublishedValue2

  • Transconductance

    2350 uS

    Characteristic;PublishedValue1

  • Transconductance

    7100 uS

    Characteristic;PublishedValue2

  • Plate Current

    5.5 mA

    Characteristic;PublishedValue1

  • Plate Current

    122 mA

    Characteristic;PublishedValue2

  • Plate Current

    46 mA

    Characteristic;PublishedValue3

  • Grid-No.l Voltage (Approx.)

    16.5 mA

    Characteristic;PublishedValue1

  • Grid-No.l Voltage (Approx.)

    3.5 mA

    Characteristic;PublishedValue2

  • for plate current

    10 V

    Characteristic;PublishedValue1

  • for plate current

    -10 V

    Characteristic;PublishedValue2

  • Plate Resistance

    8500 ohm

    Section1;Promoted

  • Transconductance

    2350 uS

    Section1;Promoted

  • Amplification Factor

    20

    Section1;Promoted

SECTION 2

Beam Power

Other

  • Maximum Plate Voltage

    250 V

    Section2;Promoted

  • Maximum Screen Voltage

    200 V

    Section2;Promoted

  • Maximum Plate Dissipation

    7 W

    Section2;Promoted

  • Maximum Screen Dissipation

    1.8 W

    Section2;Promoted

  • Maximum Cathode Current

    245 mA

    Section2;Promoted

Characteristic

  • Plate Resistance

    11700 ohm

    Section2;Promoted

  • Transconductance

    7100 uS

    Section2;Promoted