20LF6

Beam-power tube designed for television horizontal-deflection or power-amplifier service, with ratings suited to high-energy sweep operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 12GW
Socket code: B12C
Base pins: 12
Nominal heater: 20 V / 600 mA

Description

20LF6 is a beam-power tube for television deflection or power-amplifier service. The supplied RCA manual excerpt was reviewed for heater data, physical sections, maximum ratings, electrical characteristics, capacitances, and stated operating conditions.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12GW
Socket code: B12C
Base pins: 12
Nominal heater voltage: 20 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12GW - 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

Max plate voltage: 990 V
Max screen voltage: 275 V
Max plate dissipation: 40 W
Max screen dissipation: 9 W
Max cathode current: 500 mA

BeamPower section; ratings and characteristics promoted where clearly attributable.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Peak Positive Plate Voltage
8000 V
HorizontalDeflection
Temporary Overload Plate Dissipation
200 W
HorizontalDeflection
Peak Cathode Current
1.2 A
HorizontalDeflection
Typical Plate Voltage
160 V
Typical Plate Current
1400 mA

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater Voltage (ae/dc) 6.3
20 V
Heater Voltage (ae/dc) 6.3 20 volts
Heater Current 2.0
600 mA
Heater Current 2.0 0.6 ampere
Plate Voltage
990 V
Plate Voltage 990 volts
Peak Positive-Pulse Plate Voltage#
8000 V
Peak Positive-Pulse Plate Voltage# 8000 volts
Plate Dissipation
40 W
Plate Dissipation 40 watts
Grid-No.3 Voltage
50 V
Grid-No.3 Voltage 50 volts
Grid-No.2 Voltage
275 V
Grid-No.2 Voltage 275 volts
Grid-No.2 Input
9 W
Grid-No.2 Input 9 watts
Peak Negative-Pulse Grid-No.l Voltage
550 V
Peak Negative-Pulse Grid-No.l Voltage 550 volts
Heater Voltage (ac/dc)
6.3 V
Heater Voltage (ac/dc) 6.3 volts
Heater Current
600 mA
Heater Current 0.6 ampere
Heater Warm-up Time (Average)
11 s
Heater Warm-up Time (Average) 11 seconds
Plate Voltage 330
330 V
Plate Voltage 330 330 volts
Grid-No.2 (Screen-Grid) Supply Voltage —
330 V
Grid-No.2 (Screen-Grid) Supply Voltage — 330 volts
Grid-No.l Current 8
0 mA
Grid-No.l Current 8 0 mA
Plate Dissipation 1.1
3.75 W
Plate Dissipation 1.1 3.75 watts
For grid-No.2 voltages up to
165 V
For grid-No.2 voltages up to 165 volts — 1.1
For grid-No.2 voltages between 165 and
330 V
For grid-No.2 voltages between 165 and 330 volts page 300
Maximum screen-grid voltage
990 V
Published section value
Maximum plate dissipation
40 W
Published section value

Characteristic

Plate Voltage 50
160 V
Plate Voltage 50 160 volts
Grid-No. 3 (Suppressor-Grid) Voltage 0
0 V
Grid-No. 3 (Suppressor-Grid) Voltage 0 0 volts
Grid-No.2 (Sereen-Grid) Voltage 175
160 V
Grid-No.2 (Sereen-Grid) Voltage 175 160 volts
Grid-No.l (Control-Grid) Voltage — 10
0 V
Grid-No.l (Control-Grid) Voltage — 10 0 volts
Plate Current 800
1400 mA
Plate Current 800 1400 mA
Grid-No.2 Current 70
45 mA
Grid-No.2 Current 70 45 mA
Heater voltage
6.3 V
Rated heater condition