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Voltage Triode Pentode ·Pentode-Triode

PCF806

Triode-pentode from Mullard technical data; available source material does not establish a narrower functional role confidently.

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

Description

TriodePentode; electrical ratings and operating data extracted from the supplied Mullard datasheet.

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
8 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
Transconductance
0.0055 S
Amplification factor
17
Max plate voltage
125 V
Max plate dissipation
1.5 W
Max cathode current
15 mA

Triode oscillator section.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
350000 Ω
Transconductance
0.012 S
Max plate voltage
250 V
Max screen voltage
150 V
Max plate dissipation
2 W
Max screen dissipation
0.5 W
Max cathode current
18 mA

Frame-grid pentode mixer section; plate resistance published as greater than 350 kOhm.

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

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater Voltage

    8 V

  • Heater Current

    300 mA

  • Maximum Intended Frequency

    220 MHz

    FrequencyChanger

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • HeaterOrFilamentVoltage

    8 V

  • HeaterOrFilamentCurrent

    300 mA

  • Plate Voltage

    100 V

  • Plate Current

    14 mA

  • Transconductance

    5.5 mA/V

  • Amplification Factor

    17

SECTION 2

Pentode

Characteristic

  • Plate Voltage

    170 V

  • Screen Voltage

    150 V

  • Plate Current

    10 mA

  • Screen Current

    3.3 mA

  • Transconductance

    12 mA/V

  • PlateResistanceMinimum

    350 kohm

  • MaximumOperatingFrequency

    220 MHz

Data set 03

1967 Mullard Receiving and Amplifying Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate voltage

    100 V

    TriodeSection

  • Plate current

    14 mA

    TriodeSection

  • Grid voltage

    -3 V

    TriodeSection

  • Transconductance

    5500 uS

    TriodeSection

  • Amplification factor

    17

    TriodeSection

Capacitance

  • Grid-cathode/heater capacitance

    2.2 pF

    TriodeSection

  • Plate-cathode/heater capacitance

    1.2 pF

    TriodeSection

  • Plate-grid capacitance

    2 pF

    TriodeSection

SECTION 2

Pentode

Characteristic

  • Plate voltage

    170 V

    PentodeSection

  • Screen-grid voltage

    150 V

    PentodeSection

  • Plate current

    10 mA

    PentodeSection

  • Screen-grid current

    3.3 mA

    PentodeSection

  • Grid voltage

    -1.2 V

    PentodeSection

  • Transconductance

    12000 uS

    PentodeSection

  • Equivalent noise resistance

    1 kOhm

    PentodeSection

Capacitance

  • Plate input capacitance

    6 pF

    PentodeSection

  • Plate output capacitance

    3.3 pF

    PentodeSection

  • Plate-grid capacitance

    0.012 pF

    PentodeSection

Other

  • Supply voltage

    190 V

    FrequencyChanger

  • Screen-grid resistor

    18 kOhm

    FrequencyChanger

  • Plate current

    8.5 mA

    FrequencyChanger

  • Screen-grid current

    2.7 mA

    FrequencyChanger

  • Oscillator voltage RMS

    2.3 V

    FrequencyChanger

  • Conversion transconductance

    4500 uS

    FrequencyChanger

Data set 04

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • changer at frequencies up to

    220 Mc/s

  • Input Pentode cin(p)

    60 pF

  • Output Pentode cout(p)

    3.3 pF

  • Grid 1 to Anode Pentode cgl_ap

    12 pF

  • Grid 1 to Grid 2 cgrg2

    1.6 pF

  • Grid Triode to Anode Triode cgt-at

    20 pF

  • Anode Pentode to Anode Triode cap-at <

    0.03 pF

  • Anode Pentode to Grid Triode Cap-gt <

    0.01 pF

  • Grid 1 to Anode Triode Cgt-at <

    0.01 pF

  • Grid 1 to Grid Triode cgl_gt <

    0.01 pF

  • Anode Voltage Va 170

    100 V

  • Control Grid Voltage Vgl -1 2

    -30 V

  • Anode Current la 10

    14 mA

  • Mutual Conductance gm 12

    55 mA

  • Anode Voltage Va

    190 V

  • Heterodyne Voltage (R.M.S.) Vhet(r.m.s.)

    23 V

  • Anode Current la

    85 mA

  • Screen Grid Current I82

    27 mA

  • Conversion Conductance gc

    45 mA

Other

  • Heater Current Ih

    3 A

  • Heater Voltage Vh

    80 V

  • Maximum Anode Dissipation pa(max, 20

    15 W

  • Maximum Anode Voltage Va(maxi 250

    125 V

  • Maximum Cathode Current Ik(max) 18

    15 mA

  • Grid Triode to Cathode and Heater cgt-k,h

    2.2 pF

  • Anode Triode to Cathode and Heater cat-k,h

    12 pF

  • Screen Supply Voltage (Rga = 18k0) V8a(b)

    190 V