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
16 mA
Published approximate operating data
Power - Pentode (NOT beam) ·Pentode
PT240
Early Marconi directly heated output pentode developed to provide greater audio power than the PT2.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B5
- Base pins
- 5
- Nominal heater
- 2 V / 200 mA
Description
Pentode output valve providing greater power than PT2.
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
- Plate resistance
- 5000 Ω
- Transconductance
- 0.00165 S
- Max plate voltage
- 150 V
- Max screen voltage
- 150 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 02
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