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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

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Four-volt double-diode triode for receiver detector, automatic-volume-control, and audio-frequency amplification service. Two diodes handle detection and control-voltage production while the triode amplifies the recovered audio signal.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: P30
Socket code: P8A
Base pins: 8
Nominal heater: 4 V / 650 mA

Description

Indirectly heated double-diode triode for detector, AVC, and audio-frequency amplifier service.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: P30
Socket code: P8A
Base pins: 8
Nominal heater voltage: 4 V
Nominal heater current: 650 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

P30 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 200 V
Max cathode current: 0.8 mA
Rectifier max heater-cathode voltage: 50 V

Diode section of combined dual-diode triode.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 200 V
Max cathode current: 0.8 mA
Rectifier max heater-cathode voltage: 50 V

Diode section of combined dual-diode triode.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 13500 Ω
Transconductance: 0.002 S
Amplification factor: 27
Max plate voltage: 250 V
Max plate dissipation: 1.5 W
Max cathode current: 10 mA

Triode section; typical values promoted from the published operating data.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 3

Triode

Other

Typical plate voltage
250 V
Typical plate current
4 mA
Control-grid bias
-7 V

Characteristics

Transconductance
2000 µS
Amplification factor
27
Plate resistance
13500 ohm

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater or filament voltage
4 V
Published nominal value
Heater or filament current
650 mA
Published nominal value
Transconductance
2000 µS
Published operating characteristic

SECTION 3

Triode

Characteristics

Heater or filament voltage
4 V
Published nominal value
Heater or filament current
650 mA
Published nominal value
Transconductance
2000 µS
Published operating characteristic

Data set 03

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

HeaterOrFilamentVoltage
4 V
HeaterOrFilamentCurrent
1 A

Data set 04

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Maximum signal voltage
200 V
Per diode, peak
Maximum diode current
0.8 mA
Per anode

SECTION 2

Diode

Other

Maximum signal voltage
200 V
Per diode, peak
Maximum diode current
0.8 mA
Per anode

SECTION 3

Triode

Other

Typical plate voltage
250 V
Typical plate current
4 mA
Typical grid voltage
-7 V
Maximum no-current anode voltage
550 V
Maximum heater-cathode voltage
50 V

Data set 05

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Peak inverse voltage maximum
420 V
PerDiode
Diode current maximum
0.8 mA
PerDiode
Peak diode current maximum
50 mA
PerDiode

SECTION 3

Triode

Characteristic

Plate current
4 mA

Other

Heater-cathode voltage maximum
50 V