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Voltage Radio Detector Converter ·Pentode-Triode

PCF82

VHF television frequency changer with high-slope oscillator triode and high-input-impedance pentode mixer.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
B9A
Socket code
B9A
Base pins
9
Nominal heater
9.5 V / 300 mA

Description

Triode-pentode VHF television frequency changer with high-slope oscillator triode and high-input-impedance pentode mixer.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B9A
Socket code
B9A
Base pins
9
Nominal heater voltage
9.5 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B9A - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
5000 Ω
Transconductance
0.0085 S
Amplification factor
40
Max plate voltage
250 V
Max plate dissipation
1.5 W
Max cathode current
20 mA

Published values promoted where clearly readable; identical repeated sections compressed when applicable.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
400000 Ω
Transconductance
0.0052 S
Max plate voltage
250 V
Max screen voltage
110 V
Max plate dissipation
2.5 W
Max screen dissipation
0.5 W
Max cathode current
25 mA

Published ratings and characteristics promoted from the approved German 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

Triode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Plate Dissipation

    1.5 W

  • Maximum Cathode Current

    20 mA

Characteristic

  • Transconductance

    8500 µS

    Typical

  • Amplification Factor

    55

    Typical

  • Plate Resistance

    18000 ohm

    Typical

SECTION 2

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    300 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Screen Dissipation

    0.5 W

  • Maximum Cathode Current

    25 mA

Characteristic

  • Transconductance

    5200 µS

    Typical

  • Plate Resistance

    300000 ohm

    Typical

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Application

    VHF oscillator

    TriodeSection

SECTION 2

Pentode

Characteristic

  • Application

    VHF mixer

    PentodeSection

  • Referenced Characteristics

    Type ECF82/6U8

    Source explicitly refers to ECF82/6U8 for further characteristics

Data set 03

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater voltage

    9.5 V

    Published nominal value or midpoint of published range

  • Heater current

    300 mA

    Published nominal value or midpoint of published range

Capacitance

  • Pentode input capacitance

    5 pF

    Published first-page value

  • Pentode output capacitance

    2.6 pF

    Published first-page value

  • Triode input capacitance

    2.5 pF

    Published first-page value

Data set 04

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater Voltage

    9 V

  • Heater Current

    300 mA

  • Maximum Intended Frequency

    220 MHz

    FrequencyChanger

Data set 05

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Current Ih

    3 A

  • Heater Voltage Vh

    95 V

  • Maximum Anode Dissipation pa( max ) 28

    2.7 W

  • Maximum Anode Supply Voltage Va(b)max 550

    550 V

  • Maximum Anode Voltage Va(max) 300

    300 V

  • Maximum Positive D.C. Control Grid Voltage Vgl(max) 0

    0 V

  • Maximum Cathode Current Ik(max) 20

    20 mA

  • Heater Negative

    220 V

  • Heater Positive

    90 V

  • Cathode to Heater (each section) approximately ck-h

    30 pF

Characteristic

  • Grid 1 to Anode Pentode Cgl-ap 0

    6 pF

  • Pentode Input Cin(p)

    50 pF

  • Pentode Output Cout(p)

    3.5 pF

  • Triode Grid to Triode Anode Cgt-at

    18 pF

  • Triode Grid to Cathode Cgt_k

    25 pF

  • Triode Anode to Cathode cat-k

    10 pF

  • Anode Voltage Va 250

    150 V

  • Screen Grid Voltage V82

    110 V

  • Anode Current la 10

    18 mA

  • Screen Grid Current I$2

    3.5 mA

  • Mutual Conductance gm 52

    85 mA

  • Control Grid Voltage for la = 10 µA Vgl( ia-10µA) -10 —

    12 V

  • Anode Voltage Va 170 170

    100 V

  • Anode Current la 5.5 66

    7 mA