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Power - TV Horizontal Output (sweep) ·BeamPower

12JT6

The 12JT6 is a nine-pin Novar beam-power pentode designed for horizontal-deflection output amplification in television receivers. Featuring a 12.6-volt, 600-milliampere heater, it provides high peak plate-current capability, substantial pulse-voltage tolerance, and efficient sweep-circuit operation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
9QU
Socket code
-
Base pins
9
Nominal heater
12.6 V / 600 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
9QU
Socket code
-
Base pins
9
Nominal heater voltage
12.6 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9QU - 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

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
15000 Ω
Transconductance
0.0071 S
Amplification factor
4.4
Max plate voltage
770 V
Max screen voltage
220 V
Max plate dissipation
17.5 W
Max screen dissipation
3.5 W
Max cathode current
550 mA

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

1970 Sylvania Technical Manual

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Plate Voltage

    250 V

  • Average cathode current

    175 mA

    Maximum average cathode current; Sylvania 1970

  • Screen Voltage

    150 V

  • Peak positive pulse plate voltage

    6500 V

    Peak positive plate pulse; Sylvania 1970

  • Grid Voltage

    -22.5 V

  • Peak negative pulse plate voltage

    -1500 V

    Peak negative plate pulse; Sylvania 1970

  • Plate Current

    70 mA

  • Positive DC beam-plate voltage

    70 V

    DC grid 3 maximum; Sylvania 1970

  • Screen Current

    2.1 mA

  • Grid #1 voltage

    55 V

    Maximum negative DC grid 1 voltage (magnitude); Sylvania 1970

  • Grid To Plate Capacitance

    0.26 pF

  • Peak negative grid #1 voltage

    -330 V

    Peak negative control-grid pulse; Sylvania 1970

  • Input Capacitance

    15 pF

  • For grid bias feedback HV regulation

    1 MOhm

    Maximum grid 1 circuit resistance, grid-resistor-bias operation; Sylvania 1970

  • Output Capacitance

    6.5 pF

  • Grid #1 voltage

    -42 V

    Grid 1 voltage at Ib=1 mA; Sylvania 1970

  • Plate voltage

    60 V

    Instantaneous knee, screen=150V, grid 1=0V; Sylvania 1970

  • Plate current

    390 mA

    Instantaneous plate knee, plate=60V; Sylvania 1970

  • Grid #2 current

    32 mA

    Instantaneous screen knee, plate=60V; Sylvania 1970

  • Bulb Temperature (At hottest point)

    240 degC

    Maximum bulb temperature; Sylvania 1970

  • Heater warm-up time

    11 s

    Average heater warm-up time; Sylvania 1970

  • Peak Heater-Cathode Voltage

    200 V

    Heater negative relative to cathode, DC and peak; Sylvania 1970

  • Peak Heater-Cathode Voltage

    100 V

    Heater positive relative to cathode, DC; Sylvania 1970

  • Peak Heater-Cathode Voltage

    200 V

    Heater positive relative to cathode, DC and peak; Sylvania 1970