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Power - Beam (NOT sweep) ·BeamPower

50C6G

Beam-power amplifier designed for AC/DC receiver output stages, providing high audio power sensitivity from comparatively low supply voltages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7AC
Socket code
U7A
Base pins
7
Nominal heater
50 V / 150 mA

Description

Beam-power amplifier designed for the output stage of AC-DC receivers, providing high power output from low supply voltages.

Socket description

Small 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7AC
Socket code
U7A
Base pins
7
Nominal heater voltage
50 V
Nominal heater current
150 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7AC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Pin 1—NCVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN2Pin 2—H — HeaterVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN3Pin 3AP — Plate (Anode)Verified

12L6GT/25L6GT manufacturer basing, 7AC

PIN4Pin 4AG2 — Screen GridVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN5Pin 5AG1 — Control GridVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN7Pin 7—H — HeaterVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN8Pin 8ABP — Beam-Forming PlateGroup AC8Verified

12L6GT/25L6GT manufacturer basing, 7AC

PIN8Pin 8AK — CathodeGroup AC8Verified

12L6GT/25L6GT manufacturer basing, 7AC

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
18300 Ω
Transconductance
0.0071 S
Max plate voltage
200 V
Max screen voltage
135 V
Max plate dissipation
12.5 W
Max screen dissipation
1.75 W

Promoted maximum ratings; characteristics use the 200-V plate operating column where available.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Maximum plate voltage

    200 V

    Published handbook rating

  • Maximum screen voltage

    200 V

    Published handbook rating

  • Plate voltage

    135 V

    ClassA

  • Screen voltage

    135 V

    ClassA

  • Control-grid bias

    13.5 V

    ClassA

  • Plate current

    58 mA

    ClassA

  • Screen current

    3.5 mA

    ClassA

  • Load resistance

    2000 ohm

    ClassA

  • Power output

    3.6 W

    ClassA

Characteristic

  • Plate resistance

    9300 ohm

    Published handbook characteristic

  • Transconductance

    7000 µS

    Published handbook characteristic

  • Heater/filament voltage

    50 V

    Published heater/filament rating

  • Heater/filament current

    150 mA

    Published heater/filament rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    50 V

  • Heater current

    150 mA

  • Plate voltage

    125 V

    ClassA1

  • Screen voltage

    135 V

    ClassA1

  • Power output

    3.6 W

    ClassA1;125VPlate

  • Power output

    6 W

    ClassA1;200VPlate

Characteristic

  • Plate resistance

    9300 ohm

    125VPlate

  • Transconductance

    7000 uS

    125VPlate