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Power - Pentode (NOT beam) ·Pentode

7B5E

Power/output pentode designed for low-frequency or audio-frequency output amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6AE
Socket code
B8G
Base pins
8
Nominal heater
6.3 V / 400 mA

Description

The BRIMAR 7B5E is a power pentode with a 6.3 V, 0.4 A heater and 3.4 W published power output.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
6AE
Socket code
B8G
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
400 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

6AE - 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
68000 Ω
Transconductance
0.0022 S

Published operating characteristics.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Anode Voltage

    250 V

  • Anode Current

    32 mA

  • Screen Voltage

    250 V

  • Screen Current

    5.5 mA

  • Control Grid Voltage

    -15 V

  • Cathode Bias Resistor

    500 ohm

  • Optimum Load

    7600 ohm

  • Power Output

    3.4 W