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PY81

Indirectly heated television booster or damper diode for transformerless line time-base circuits, with approximately 5.6 kV inverse-voltage capability and 150 mA average current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 17 V / 300 mA

Description

Indirectly heated television booster/damper diode with high heater-to-cathode withstand for flyback service.

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: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 17 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max plate dissipation: 3.5 W
Max cathode current: 150 mA
Rectifier peak inverse voltage: 5600 V
Rectifier nominal output current: 150 mA
Rectifier peak forward current: 400 mA
Rectifier max heater-cathode voltage: 600 V

Rectifier section; promoted values are taken from the approved source where explicitly published.

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 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Perveance
2.4 mA
Rectifier

Capacitance

Plate capacitance. . . Ca
64 pF
Rectifier
Cathode-heater capacitance Ckf
28 pF
Rectifier

Other

Courant de la diode . . Id
150 mA
Rectifier
ration
4 uF
Rectifier
cathode
600 V
Rectifier
filament et cathode. . Vkfer
900 V
Rectifier
filament et cathode. . Vkfer
0 V
Rectifier
anode et cathode. . . Vaker
0 V
Rectifier
anode et filament . . Vafer
0 V
Rectifier

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Inverse plate voltage maximum
4.5 kV
DC plate current maximum
150 mA
Peak plate current maximum
450 mA
Duty ratio maximum
1:5.5
Pulse duration maximum
18 µs

Data set 03

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Application

Application
Television line time-base booster/damper service

Other

Peak anode-cathode voltage maximum
5.6 kV
Pulse

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak Anode Current
450 mA
Mean Anode Current
150 mA
Heater-Cathode Voltage During Flyback
4500 V
HeaterNegative

Characteristic

Application
Television booster/damper diode

Data set 05

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Application

Application
Television booster / damper diode

Data set 06

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak inverse voltage maximum
5000 V
BoosterDiode
Peak inverse voltage absolute maximum
5600 V
BoosterDiode
Average plate current maximum
150 mA
BoosterDiode
Peak plate current maximum
450 mA
BoosterDiode
Plate dissipation maximum
3.5 W
BoosterDiode
Heater-to-cathode peak voltage maximum
5000 V
BoosterDiode
Heater-to-earth voltage maximum
220 V
SeriesString
Application
Booster diode in transformerless television line time-base circuits
Section1

Capacitance

Plate capacitance
6.4 pF
Section1
Cathode-to-heater capacitance
2.8 pF
Section1

Data set 07

1967 Mullard Receiving and Amplifying Valves

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Booster d iode with
4.75
Characteristic

Other

*P.I.V. max
5 V
LIMITING VALUES
* ia(Pk ) max
450 mA
LIMITING VALUES
* Va - h(IJ k j
3 kV
LIMITING VALUES

Data set 08

1972 Philips Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

HeaterVoltageNominal
17 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Dissipation
3.5 W
Maximum Cathode Current
150 mA
Maximum Peak Inverse Voltage
5600 V
PeakForwardCurrent
450 mA
MaximumPeakAnodeVoltageDesignCentre
5000 V
Pulse

Data set 09

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Heater voltage
17 V
Published nominal value
Heater current
300 mA
Published nominal value

Other

Maximum peak heater-cathode voltage
4.5 kV
Flyback; heater negative

Data set 10

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Anode current, peak Iap max
45 mA
Anode current, peak Iap max. 45 mA
Anode voltage, peak Vap max
5000 V
Anode voltage, peak Vap max. 5000 V
Cathode to heater voltage, peak kap max
0 V
Cathode to heater voltage, peak kap max. 000 V
Heater current Ig
300 mA
Heater current Ig 300 mA
Heater voltage V¢
17 V
Heater voltage V¢ 17V
Anode to all Ca
6.4 pF
Anode to all Ca 6.4 pF
Cathode to heater Ckf
2.8 pF
Cathode to heater Ckf 2.8 pF
Supply voltage Vbo max
550 V
Supply voltage Vbo max. 550 V
Anode dissipation W, max
3.5 W
Anode dissipation W, max. 3.5 W
Anode current, average Iy max
150 mA
Anode current, average Iy max 150 mA
Cathode to heater voltage, peak kap max
5000 V
Cathode to heater voltage, peak kap max. 5000 V l)