7AH7

Lock-In semi-remote-cutoff pentode voltage amplifier with moderately high transconductance, low interelectrode capacitances, and economical heater power. Its controlled characteristic supports variable-gain signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8V
Socket code: B8G
Base pins: 8
Nominal heater: 6.3 V / 150 mA

Description

The 7AH7 is A HEATER-CATHODE TYPE SEMI-REMQTE CUT-OFF PENTODE VOLTAGE AMPLIFIER USING THE LOCK~IN CONSTRUCTICON. IT {S CHARACTERIZED BY MQD- ERATELY HIGH TRANSCONDUCTANCE AND LOW INTERELECTRODE CAPACITANCES AS WELL AS ECONOMY OF HEATER POWER.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8V
Socket code: B8G
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8V - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1H	—	H — Heater EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN2P	A	P — Plate (Anode) EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN3G2	A	G2 — Screen Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN4G3	A	G3 — Suppressor Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN5IS	A	IS — Internal Screen EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V
PIN6G1	A	G1 — Control Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V
PIN7K	A	K — Cathode EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V
PIN8H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0033 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2 W
Max screen dissipation: 0.7 W

Promoted from printed maximum/characteristic columns; additional published values are retained in TUBE_SECTION_PARAMETER.

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

Pentode

Capacitance

Input capacitance
7 pF
Section1
Output capacitance
6.5 pF
Section1
Grid-to-plate capacitance
0.005 pF
Section1

Other

Typical plate voltage
250 V
ClassA
Typical screen voltage
250 V
ClassA
Typical plate current
6.8 mA
ClassA
Typical screen current
1.9 mA
ClassA

Characteristic

Plate resistance
1000000 Ohm
Section1
Transconductance
3300 uS
Section1

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Nominal
Heater current
150 mA
Nominal
Plate voltage
300 V
Typical operating conditions
Screen voltage
300 V
Typical operating conditions
Plate current
6.6 mA
Typical operating conditions
Screen current
1.9 mA
Typical operating conditions