18FW6

Semi-remote-cutoff miniature pentode for RF and IF amplification in 100 mA series-heater AC/DC radio receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CC
Socket code: B7G
Base pins: 7
Nominal heater: 18 V / 100 mA

Description

The 18FW6 is a 7-pin semi-remote-cutoff pentode with a 100 mA heater, designed for RF and IF amplifier service in AC/DC radio receivers.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CC
Socket code: B7G
Base pins: 7
Nominal heater voltage: 18 V
Nominal heater current: 100 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CC - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 250000 Ω
Transconductance: 0.0041 S
Max plate voltage: 150 V
Max screen voltage: 150 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.6 W

Semi-remote-cutoff RF/IF pentode; screen voltage governed by published rating chart, with 150 V maximum screen supply.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

TransconductancePublished
4400 uS

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Grid 1-to-plate capacitance
0.0035 pF
WholeTube
Input capacitance
5.5 pF
WholeTube
Output capacitance
5 pF
WholeTube
Grid 1 voltage for 25 µS transconductance
-20 V
WholeTube

Other

Maximum plate voltage
150 V
WholeTube
Maximum screen supply voltage
150 V
WholeTube
Maximum plate dissipation
2.5 W
WholeTube
Maximum screen dissipation
0.6 W
WholeTube
Plate voltage
200 V
TypicalOperation
Screen voltage
100 V
TypicalOperation
Plate current
11 mA
TypicalOperation
Screen current
4.4 mA
TypicalOperation
Transconductance
4400 µS
TypicalOperation
Plate resistance
250000 ohm
TypicalOperation

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid1 To Plate Capacitance
0.0035 pF
Input Capacitance
5.5 pF
Output Capacitance
5 pF

Other

Typical Plate Voltage
100 V
Typical Screen Voltage
100 V
Cathode Bias Resistance
48 ohm

Characteristic

Typical Plate Current
9 mA
Typical Screen Current
3.9 mA
Grid1 Voltage At25u S
-20 V