Alternatives & variations Download PDF datasheet

PCF808

Triode-pentode for television IF amplification with a general-purpose scanning-oscillator triode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: B9A
Socket code: B9A
Base pins: 9
Nominal heater: 7.4 V / 300 mA

Description

Triode-pentode for television IF amplification with a general-purpose scanning-oscillator triode. 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: 7.4 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

Plate resistance: 31000 Ω
Transconductance: 0.0055 S
Amplification factor: 17
Max plate voltage: 250 V
Max plate dissipation: 2 W
Max cathode current: 15 mA

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

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0145 S
Max plate voltage: 250 V
Max screen voltage: 230 V
Max plate dissipation: 2 W
Max screen dissipation: 0.7 W
Max cathode current: 18 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 1

Triode

Other

Heater Current Ih
300 mA
Heater Voltage Vh
7.4 V
Maximum Anode Dissipation Pa(max) 20
2 W
Maximum Screen Grid Dissipation Pg2(max)
0.7 W
Maximum Anode Voltage Va(max) 250
250 V
Maximum Screen Grid Voltage Vg2(max
230 V
Maximum Heater to Cathode Voltage (R.M.S.) Vh-k(r.m.s.)max 200
200 V
Maximum Cathode Current k(max) 15
18 mA

Characteristic

Grid 1 to Earth cg1_E &
4 pF
Anode Pentode to Earth cap_E
27 pF
Anode Pentode to Grid 1 cap_g1
0.008 pF
Anode Pentode to Grid 2 cap_g2
35 pF
Grid 1 to Grid 2 cg1_g2
21 pF
Grid Triode to Earth cgt_E
2.4 pF
Anode Triode to Earth cat-E
16 pF
Anode Triode to Grid Triode Cat-gt
2.1 pF
Anode Triode to Anode Pentode cat-ap
2 pF
Grid Triode to Grid 1 Cgt_g1 0
15 pF
Grid Triode to Anode Pentode cgt_ap 0
2 pF
Grid 1 to Anode Triode cg1_at
0.006 pF
Anode Voltage Va 100
160 V
Screen Grid Voltage Vg2
160 V
Control Grid Voltage Vg1 -30
-17 V
Anode Current la 14
12 mA
Screen Grid Current Ig2
4 mA
Mutual Conductance gm 5.5
14.5 mA