8118

Quick-heating internally neutralized twin tetrode designed for RF power amplification and frequency multiplication in mobile or fixed equipment. Two physical tetrode sections provide compact paired RF operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 16 V / 4.25 A

Description

The Telefunken 8118 is a quick-heating, internally neutralized twin tetrode for RF power amplification and frequency multiplication in mobile or fixed equipment.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 16 V
Nominal heater current: 4.25 A
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

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0025 S
Max plate voltage: 600 V
Max screen voltage: 300 V
Max plate dissipation: 10 W
Max screen dissipation: 1.5 W
Max grid dissipation: 0.5 W
Max cathode current: 80 mA

Published ratings/characteristics promoted from the source; representative section used for repeated identical systems where applicable.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0025 S
Max plate voltage: 600 V
Max screen voltage: 300 V
Max plate dissipation: 10 W
Max screen dissipation: 1.5 W
Max grid dissipation: 0.5 W
Max cathode current: 80 mA

Second identical physical tetrode section; added to align rows with SectionCount.

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Transconductance
2500 µS

Other

Maximum Plate Voltage
600 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
10 W
Maximum Screen Dissipation
1.5 W
Maximum Grid Dissipation
0.5 W
Maximum Cathode Current
80 mA

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater Voltage
16 V
Heater Current
4.25 A
Heater Warmup Time
0.5 s
Maximum
Maximum Intended Frequency
500 MHz
Transconductance
25000 uS
Each section