PT2

Early OSRAM directly heated battery-era power pentode for receiver audio output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B5
Base pins: 5
Nominal heater: 2 V / 200 mA

Description

OSRAM PT2 pentode for amplification or power-output service as specified in the supplied datasheet.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
Base pins: 5
Nominal heater voltage: 2 V
Nominal heater current: 200 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

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0025 S
Max plate voltage: 150 V
Max screen voltage: 50 V

Published maximum ratings and characteristics audited; remaining useful numerical data retained in parameter table.

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

192X Marconi Valve

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical anode current at 150 V
6.5 mA
Published approximate operating data

Data set 02

1937 Osram Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Optimum load resistance
16700 ohm
Published operating data

Data set 03

193X Osram

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater/Filament Voltage
2 V
Published datasheet value
Heater/Filament Current
200 mA
Published datasheet value
Maximum Anode Voltage
150 V
Published datasheet value
Maximum Screen Voltage
150 V
Published datasheet value

Characteristics

Mutual Conductance
2500 µS
Published datasheet value

Data set 04

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Published value [1]
20
20/- PT2 FILAMENT VOLTS 2.0 MAX.
Published value [2]
2
20/- PT2 FILAMENT VOLTS 2.0 MAX.
" FILAMENT CURRENT [1]
0 mA
" FILAMENT CURRENT 0-2 AMP
" FILAMENT CURRENT [2]
-2 A
" FILAMENT CURRENT 0-2 AMP
MAX. ANODE VOLTS
150
MAX. ANODE VOLTS 150]_.
PT [1]
2 mA/V
PT.2 is a new pentode 0 ——— MUTUAL CONDUCTANCE 2:5 MA/Y
PT [2]
0 mA/V
PT.2 is a new pentode 0 ——— MUTUAL CONDUCTANCE 2:5 MA/Y
PT [3]
2 mA/V
PT.2 is a new pentode 0 ——— MUTUAL CONDUCTANCE 2:5 MA/Y
PT [4]
5 mA/V
PT.2 is a new pentode 0 ——— MUTUAL CONDUCTANCE 2:5 MA/Y
portance. Output is quite
-8
portance. Output is quite -8 . -~ OSSN,
while its small current
5 mA
while its small current 5
PT
240
PT.240 is a pentode output valve
urs L4
150 W
urs L4 150 A/}m’;‘j power output is appreciably greater
@ IMPEDANCE
55000 ohm
@ IMPEDANCE 55000 Orms — L. . . .
kS MUTUAL CONDUCTANCE [1]
1 mA/V
kS MUTUAL CONDUCTANCE 1 65 Ma/Ver _| teristic high amplification factor of the
kS MUTUAL CONDUCTANCE [2]
65 mA/V
kS MUTUAL CONDUCTANCE 1 65 Ma/Ver _| teristic high amplification factor of the