1AH6

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 6AU
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 25 mA

Description

Directly heated combination diode and sharp-cutoff audio-frequency pentode for low-current Class-A amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 6AU
Socket code: -
Base pins: -
Nominal heater voltage: 1.4 V
Nominal heater current: 25 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

6AU - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN11G3	A	G3 — Suppressor GridGroup 6AU1 Original EIA label 1G3; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN1F	—	F — FilamentGroup 6AU1 Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN32P	B	P — Plate (Anode) Original EIA label 2P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN41G2	A	G2 — Screen Grid Original EIA label 1G2; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN51P	A	P — Plate (Anode) Original EIA label 1P; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN61G1	A	G1 — Control Grid Original EIA label 1G1; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU
PIN7F	—	F — Filament Original EIA label F; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 127, 6AU

Section ratings

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

General Electric identifies 1AH6 as a directly heated battery diode plus sharp-cutoff AF pentode, 1.4 V 25 mA filament. This physical diode serves low-level signal detection. The condensed tabulation supplies no separate defensible diode absolute limits; existing NULL ratings retained. Other combined tube section is an AF pentode. Do not transfer values from ambiguous neighboring rows in condensed characteristic chart.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Max plate voltage: 90 V
Max screen voltage: 90 V

General Electric 1AH6 sharp-cutoff AF pentode with separate signal-detector diode, directly heated 1.4 V 25 mA battery filament. Published maximum plate 90 V and screen 90 V already retained. Condensed manufacturer's chart has neighboring-type OCR alignment uncertainty, so no unsupported gm, plate resistance or dissipation values promoted. Prior operating-point parameter records are preserved without modification.

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 2

Pentode

Other

Plate voltage
85 V
ClassA
Screen voltage
35 V
ClassA
Plate current
0.05 mA
ClassA
Screen current
0.015 mA
ClassA
Load resistance
1000000 Ω
ClassA

Characteristic

Amplification
62
ClassA