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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

CBC1

All-current double-diode triode combining two detector diodes with a voltage-amplifier triode. It integrates receiver detection, automatic gain control, and low-frequency amplification in a series-heater valve.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
3
Base
-
Socket code
P8A
Base pins
8
Nominal heater
13 V / 200 mA

Description

All-current double-diode triode for detector, automatic-gain-control, and low-frequency amplifier service.

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

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances
Max plate voltage
200 V
Max cathode current
0.8 mA
Rectifier max heater-cathode voltage
125 V

Diode section of combined dual-diode triode.

Section 2

Diode

X-ray radiationInterelectrode capacitances
Max plate voltage
200 V
Max cathode current
0.8 mA
Rectifier max heater-cathode voltage
125 V

Diode section of combined dual-diode triode.

Section 3

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
13500 Ω
Transconductance
0.002 S
Amplification factor
27
Max plate voltage
250 V
Max plate dissipation
1.5 W
Max cathode current
10 mA

Triode section; typical values promoted from the published operating data.

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 3

Triode

Other

  • Plate voltage

    200 V

    Published table operating point

  • Plate current

    4 mA

    Published table operating point

  • Control-grid bias

    5 V

    Published table operating point

  • Alternate plate voltage

    100 V

    OperatingPoint2

  • Alternate plate current

    2 mA

    OperatingPoint2

  • Alternate control-grid bias

    2.5 V

    OperatingPoint2

Characteristic

  • Transconductance

    2000 µS

    Published table characteristic

  • Amplification factor

    27

    Published table characteristic

  • Plate resistance

    13500 ohm

    Published table characteristic

  • Heater/filament voltage

    13 V

    Published heater/filament rating

  • Heater/filament current

    200 mA

    Published heater/filament rating

  • Alternate transconductance

    1800 µS

    OperatingPoint2

  • Alternate amplification factor

    27

    OperatingPoint2

  • Alternate plate resistance

    15000 ohm

    OperatingPoint2

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Diode peak voltage maximum

    200 V

  • Diode current maximum

    0.8 mA

Capacitance

  • Diode-cathode capacitance

    2.3 pF

SECTION 2

Diode

Other

  • Diode peak voltage maximum

    200 V

  • Diode current maximum

    0.8 mA

Capacitance

  • Diode-cathode capacitance

    3 pF

SECTION 3

Triode

Other

  • Anode voltage

    200 V

  • Grid bias

    -5 V

  • Anode current

    4 mA

  • Cold anode voltage maximum

    550 V

  • Grid leak resistance maximum

    1.5 MΩ

Capacitance

  • Grid-anode capacitance

    1.7 pF

Data set 03

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Maximum signal voltage

    200 V

    Per diode, peak

  • Maximum diode current

    0.8 mA

    Per anode

SECTION 2

Diode

Other

  • Maximum signal voltage

    200 V

    Per diode, peak

  • Maximum diode current

    0.8 mA

    Per anode

SECTION 3

Triode

Other

  • Typical plate voltage

    200 V

  • Typical plate current

    4 mA

  • Typical grid voltage

    -5 V

  • Maximum no-current anode voltage

    550 V

  • Maximum heater-cathode voltage

    125 V

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 3

Triode

Other

  • Typical plate voltage

    250 V

  • Maximum plate current

    10 mA