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Power - Pentode (NOT beam) ·Pentode

1V5

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

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 output pentode for very small radio sets and amplifiers, with low filament power and operation from battery supplies.

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: 150000 Ω
Transconductance: 0.00075 S
Max plate voltage: 100 V
Max screen voltage: 100 V

Directly heated power-amplifier pentode for low-voltage battery-operated output stages.

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

Other

Plate voltage
67.5 V
ClassA; OperatingPoint1
Screen voltage
67.5 V
ClassA; OperatingPoint1
Control-grid bias
4.5 V
ClassA; OperatingPoint1
Plate current
2 mA
ClassA; OperatingPoint1
Screen current
0.4 mA
ClassA; OperatingPoint1
Load resistance
25000 ohm
ClassA; OperatingPoint1
Power output
0.05 W
ClassA; OperatingPoint1
Plate voltage
45 V
ClassA; OperatingPoint2
Screen voltage
45 V
ClassA; OperatingPoint2
Control-grid bias
3 V
ClassA; OperatingPoint2
Plate current
1 mA
ClassA; OperatingPoint2
Screen current
0.2 mA
ClassA; OperatingPoint2
Load resistance
40000 ohm
ClassA; OperatingPoint2
Power output
0.015 W
ClassA; OperatingPoint2
Plate voltage
30 V
ClassA; OperatingPoint3
Screen voltage
30 V
ClassA; OperatingPoint3
Control-grid bias
2 V
ClassA; OperatingPoint3
Plate current
0.5 mA
ClassA; OperatingPoint3
Screen current
0.1 mA
ClassA; OperatingPoint3
Load resistance
50000 ohm
ClassA; OperatingPoint3
Power output
0.005 W
ClassA; OperatingPoint3
Maximum plate voltage
100 V
Maximum screen voltage
100 V

Characteristics

Plate resistance
150000 ohm
ClassA; OperatingPoint1
Transconductance
750 uS
ClassA; OperatingPoint1
Plate resistance
175000 ohm
ClassA; OperatingPoint2
Transconductance
600 uS
ClassA; OperatingPoint2
Plate resistance
200000 ohm
ClassA; OperatingPoint3
Transconductance
450 uS
ClassA; OperatingPoint3