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Voltage Radio Detector Converter ·Octode

CK1

Indirectly heated octode frequency changer for AC/DC superheterodyne receivers. It combines oscillator and controllable mixer functions in one multi-grid valve designed for series-string operation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
P8A
Base pins
8
Nominal heater
13 V / 200 mA

Description

The Telefunken CK1 is an indirectly heated 200 mA AC/DC octode used as a controllable mixer in superheterodyne receivers.

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
13 V
Nominal heater current
200 mA
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

Octode

X-ray radiationInterelectrode capacitances
Plate resistance
1500000 Ω
Transconductance
0.0006 S
Max plate voltage
200 V
Max screen voltage
90 V
Max plate dissipation
0.5 W
Max screen dissipation
0.3 W
Max cathode current
10 mA

Octode mixer/oscillator; canonical TubeType and SectionType lists have no Octode value, so Other is used.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Octode

Other

  • Plate voltage

    200 V

    Published table operating point

  • Plate current

    1.6 mA

    Published table operating point

  • Control-grid bias

    1.5 V

    Published table operating point

  • Screen voltage

    90 V

    Published table operating point

  • Screen current

    2 mA

    Published table operating point

Characteristic

  • Transconductance

    550000 µS

    Published table characteristic

  • Plate resistance

    1000000 ohm

    Published table characteristic

  • Heater/filament voltage

    13 V

    Published heater/filament rating

  • Heater/filament current

    200 mA

    Published heater/filament rating

Capacitance

  • Grid-to-plate capacitance

    0.06 pF

    Published table capacitance

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Octode

Characteristics

  • Heater Current

    200 mA

    Series-heater AC/DC operation

Other

  • Maximum Heater-to-Cathode Peak Voltage

    125 V

Data set 03

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Octode

Other

  • Typical oscillator-modulator plate current

    1.6 mA

  • Oscillator effective grid voltage

    8.5 V

  • Maximum no-current anode voltage

    400 V

  • Maximum heater-cathode voltage

    125 V

Characteristic

  • Typical conversion transconductance

    0.0006 A/V

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Octode

Characteristic

  • Conversion transconductance

    600 µS

    FrequencyConverter