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Power - Pentode (NOT beam) ·Pentode

6L50V

High-voltage pulse version of the 6L50 power pentode, designed for multi-kilovolt pulse amplification and switching with substantial short-duration current capability.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
S9/25
Socket code
B9D
Base pins
9
Nominal heater
6.3 V / 1 A

Description

High-voltage pulse-rated version of the 6L50 power pentode.

Socket description

Magnoval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
S9/25
Socket code
B9D
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
1 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

S9/25 - 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
75000 Ω
Transconductance
0.0035 S
Max plate voltage
4500 V
Max screen voltage
800 V
Max plate dissipation
18 W
Max screen dissipation
3 W
Max cathode current
100 mA

Electrical section mapped from published characteristics and maximum ratings.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate voltage

    400 V

  • Screen voltage

    250 V

  • Plate current

    30 mA

  • Transconductance

    3500 uS

Other

  • Pulse plate voltage

    3000 V

    PulseOperation

  • Pulse plate current

    330 mA

    PulseOperation

Data set 02

1969 Tesla Manual of Electronic Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

    Published nominal value

  • Heater current

    1 A

    Published nominal value

  • Transconductance

    3500 µS

    Published operating characteristic

Other

  • Maximum plate dissipation

    18 W

    Published maximum rating

  • Maximum pulse duration

    10 us

    Published pulse limit