Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Radio Detector Converter ·Pentode-Triode

PCF800

VHF triode-pentode frequency changer for AC/DC television receivers.

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

Description

VHF triode-pentode frequency changer for AC/DC television receivers. The supplied English-language Mazda/Thorn-AEI datasheet was used for the technical and descriptive extraction.

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
8.3 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

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.009 S
Amplification factor
55
Max plate voltage
250 V
Max screen voltage
175 V
Max plate dissipation
1.7 W
Max screen dissipation
0.5 W
Max cathode current
14 mA

Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when applicable.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.006 S
Amplification factor
20
Max plate voltage
250 V
Max plate dissipation
1.5 W
Max cathode current
15 mA

Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when applicable.

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

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 2

Triode

Other

  • Heater Current Ih

    300 mA

  • Heater Voltage Vh

    8.3 V

  • Maximum Anode Dissipation Pa(max) 1.5

    1.7 W

  • Maximum Screen Dissipation Pg2(max)

    0.5 W

  • Maximum Anode Voltage Va(max) 250

    250 V

  • Maximum Screen Voltage Vg2(max)

    175 V

  • Maximum Heater to Cathode Voltage (RMS) Vh-k(r.m.s.)max

    200 V

  • Maximum Cathode Current Ik(max) 15

    14 mA

  • Supply Voltage Vb

    200 V

Characteristic

  • Grid 1 to all cin(p) 66 68

    7.7 pF

  • Anode Pentode to all cout(p) 46 4.9

    5.9 pF

  • Anode Pentode to Grid 1 cap-g1 0 013 0017

    2 pF

  • Grid 1 to Grid 2 cg1_g2 23 23

    23 pF

  • Grid Triode to Earth cgt-E 28 30

    38 pF

  • Anode Triode to Earth cat-E 27 29

    3.7 pF

  • Anode Triode to Grid Triode cat-gt 16 17

    18 pF

  • Anode Triode to Anode Pentode cat-ap 0 016 0 022 0

    26 pF

  • Anode Pentode to Grid Triode ca p-gt 0 003 0 005

    0.006 pF

  • Grid 1 to Grid Triode cg1-gt 0 012 002

    4 pF

  • Grid 1 to Anode Triode cg1-at 0 006 001 0

    15 pF

  • Anode Voltage Va 100

    170 V

  • Screen Voltage Vg2 —

    170 V

  • Anode Current la 15

    10 mA

  • Mutual Conductance gm 6

    9 mA

  • Anode Voltage (Decoupling resistance=4 7kQ) Va

    164 V

  • Screen Voltage (Rg2=27kf2) Vg2

    138 V

  • Conversion Conductance gc

    3.3 mA

  • Heterodyne Peak Voltage vhet(pk)

    37 V

  • Anode Current (Approximate) la

    76 mA

  • Screen Current (Approximate) Ig2

    2.3 mA

  • Anode Voltage Va

    120 V

  • Average Anode Current la(av)

    6 mA