PCF812

Multi-section television valve intended for video-output and associated signal-processing service, combining a small-signal section with a power output section in one envelope.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: B9A
Socket code: -
Base pins: 9
Nominal heater: 10.4 V / 300 mA

Description

Triode beam-tetrode optimized for television sync separation and line-scan oscillator service. The supplied English-language Mazda/Thorn-AEI datasheet was used for the technical and descriptive extraction.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B9A
Socket code: -
Base pins: 9
Nominal heater voltage: 10.4 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: 18
Max plate voltage: 250 V
Max plate dissipation: 2 W

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

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.008 S
Amplification factor: 44
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 3 W
Max screen dissipation: 1 W

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 1

Triode

Other

Heater Current Ih
3 A
Heater Voltage Vh
104 V
Maximum Anode Dissipation pa(max) 20
30 W
Maximum Screen Grid Dissipation p82 (maxl —
1 W
Maximum Anode Voltage Va(max) 250
250 V
Maximum Screen Grid Voltage V$2 (max) —
250 V

Characteristic

Grid 1 to Earth c$1_E 7.8 80
91 pF
Anode Tetrode to Earth caq -E 24 27
3.8 pF
Grid 1 to Anode Tetrode cgl_aq 0 033 0 047 0
75 pF
Grid Triode to Earth cgt_E 22 245
325 pF
Anode Triode to Earth Cat-E 21 23
30 pF
Grid Triode to Anode Triode cgt-at 23 24
27 pF
Grid 1 to Anode Triode cgl_at 00065 0016
3 pF
Grid Triode to Anode Tetrode Cgt-aq 0.0073 0 012 0
15 pF
Anode Tetrode to Anode Triode caq-at 0 035 0 043 0
46 pF
Grid 1 to Grid Triode c$1-gt 0 002 00055
94 pF
$ Total capacity including
89 A
Anode Voltage Va 200
170 V
Screen Grid Voltage V$2
170 V
,— Control Grid Voltage V$1 -7.7 -2
0 V
Anode Current la 10
10 mA
Screen Grid Current I82 —
25 mA
Mutual Conductance gm 34
8 mA
■H.• _
8 w
40 80 120 160 200 240
2 W
40 V'a a
200 V