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Power - Beam (NOT sweep) ·BeamPower

6AH5G

Television-oriented beam-power output tube with 6.3 V/0.9 A heater, 18.5 W maximum plate dissipation and special six-contact octal base.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 900 mA

Description

Philco 6AH5G is an indirectly heated beam-power amplifier tube designed for television circuits. It has electrical characteristics stated to be identical to the 6L6G, with a special six-contact octal arrangement (pins 3 and 5 omitted) to increase breakdown voltage between plate and other elements. Heater 6.3 V at 0.9 A. Maximum plate voltage 350 V, screen voltage 250 V, plate dissipation 18.5 W and screen dissipation 2.7 W. Class A1 beam operation and triode-connected screen-to-plate conditions are specified separately.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
900 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

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
33000 Ω
Transconductance
0.0052 S
Max plate voltage
350 V
Max screen voltage
250 V
Max plate dissipation
18.5 W
Max screen dissipation
2.7 W

Beam-power section. Published Class A1 beam operation: plate 350 V, screen 250 V, grid -18 V, gm approx 5200 µmhos, rp approx 33000 ohms, zero-signal plate current 54 mA, screen current 2.5 mA, output 10.8 W. Alternative triode connection (screen tied to plate) is an operating mode, not a separate physical section: plate 250 V, grid -5 V, gm approx 4700 µmhos, rp approx 1700 ohms, output 1.4 W. Values from Philco/RMA sheet; some OCR digits are unclear.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Screen voltage

    250 V

    Class A1 beam-tetrode connection; typical screen voltage

  • Transconductance

    5200 µmho

    Class A1 beam-tetrode connection; typical transconductance

  • Plate resistance

    33000 Ω

    Class A1 beam-tetrode connection; approximate plate resistance

  • Power Output

    10.8 W

    Class A1 beam-tetrode connection; typical output power

  • Screen current

    2.5 mA

    Class A1 beam-tetrode connection; zero-signal screen current

  • Transconductance

    4700 µmho

    Class A1 triode-connected (screen tied to plate); approximate transconductance

  • Plate resistance

    1700 Ω

    Class A1 triode-connected (screen tied to plate); approximate plate resistance

  • Power Output

    1.4 W

    Class A1 triode-connected (screen tied to plate); typical output power

  • Screen voltage

    250 V

    Class A1 triode-connected: screen connected to plate at 250 V