25A6GT

Power/output pentode designed for Class-A, single-ended, or push-pull audio-frequency output amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7S
Socket code: IO
Base pins: 7
Nominal heater: 25 V / 300 mA

Description

5A6GT HYTRON BANTAM GENERAL DESCRIPTIOR Application: The Hytron 25a8GT4s a cathode type power pentode suitable for use in the output stage of radio receivers.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7S
Socket code: IO
Base pins: 7
Nominal heater voltage: 25 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7S - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1IS	A	IS — Internal Screen EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN2H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN3P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN4G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN5G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN8G3	A	G3 — Suppressor GridGroup 7S8 EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN8K	A	K — CathodeGroup 7S8 EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 42000 Ω
Transconductance: 0.002375 S
Max plate voltage: 180 V
Max screen voltage: 135 V
Max plate dissipation: 4.3 W
Max screen dissipation: 1.9 W

Promoted ratings/characteristics from 25A6GT.pdf.

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
8.5 pF
Output capacitance
12.5 pF
Grid-to-plate capacitance
0.2 pF

Other

Plate voltage
160 V
ClassA
Screen-grid voltage
120 V
ClassA
Grid voltage
-18 V
ClassA
Plate current
33 mA
ClassA
Screen-grid current
6.5 mA
ClassA
Load resistance
5000 ohm
ClassA
Power output
2.2 W
ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
160 V
ClassA
Screen Voltage
120 V
ClassA
Power Output
2.2 W
ClassA
Load Resistance
5000 ohm
ClassA