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Voltage Pentode - Sharp Cutoff (single) ·Pentode

1W5

Subminiature directly heated sharp-cutoff RF pentode for compact battery-powered high-frequency receiver stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8CP
Socket code: B8D
Base pins: 8
Nominal heater: 1.25 V / 40 mA

Description

A directly heated sharp-cutoff RF pentode for very small radio sets and amplifiers, suitable for battery operation and using low filament power.

Socket description

Subminiature 8-lead

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8CP
Socket code: B8D
Base pins: 8
Nominal heater voltage: 1.25 V
Nominal heater current: 40 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8CP - 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: 700000 Ω
Transconductance: 0.000735 S
Max plate voltage: 100 V
Max screen voltage: 100 V

Directly heated sharp-cutoff RF pentode for low-voltage amplifier service.

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

Characteristics

Input capacitance
2.3 pF
Output capacitance
3 pF
Grid-to-plate capacitance
0.009 pF
Plate resistance
700000 ohm
ClassA; OperatingPoint1
Transconductance
735 uS
ClassA; OperatingPoint1
Plate resistance
700000 ohm
ClassA; OperatingPoint2
Transconductance
430 uS
ClassA; OperatingPoint2

Other

Plate voltage
67.5 V
ClassA; OperatingPoint1
Screen voltage
67.5 V
ClassA; OperatingPoint1
Control-grid bias
0 V
ClassA; OperatingPoint1
Plate current
1.85 mA
ClassA; OperatingPoint1
Screen current
0.75 mA
ClassA; OperatingPoint1
Plate voltage
30 V
ClassA; OperatingPoint2
Screen voltage
30 V
ClassA; OperatingPoint2
Control-grid bias
0 V
ClassA; OperatingPoint2
Plate current
0.45 mA
ClassA; OperatingPoint2
Screen current
0.16 mA
ClassA; OperatingPoint2
Maximum plate voltage
100 V
Maximum screen voltage
100 V