C3C

Remote-cutoff variable-mu pentode using a 4 V heater and providing a wide control range of anode current and transconductance. Its extended characteristic is designed for smoothly controlled signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 4 V / 1.1 A

Description

A remote-cutoff (variable-mu) pentode with a 4 V heater and a wide control range of anode current and transconductance.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: P8A
Base pins: 8
Nominal heater voltage: 4 V
Nominal heater current: 1.1 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 650000 Ω
Transconductance: 0.0025 S
Max plate voltage: 250 V
Max screen voltage: 100 V
Max plate dissipation: 2 W
Max screen dissipation: 1 W

Published ratings and characteristics promoted from the approved source.

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 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Anode voltage
220 V
Screen-grid voltage
100 V
Grid bias
-2 to -18 V
Anode current
10 to 1.5 mA
Screen-grid current
3.5 to 0.5 mA
Transconductance range
2.5 to 0.1 mA/V
Cold anode voltage maximum
400 V
Cold screen-grid voltage maximum
400 V
Grid leak resistance maximum
300 kΩ

Capacitance

Grid-anode capacitance
8 mpF