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Power - Beam (NOT sweep) ·BeamPower

8278

Beam-power tetrode designed for push-pull audio-output stages, providing substantial plate dissipation for power-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 1.2 A

Description

Beam-power tetrode designed for push-pull audio-output stages.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 1.2 A
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

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 7300 Ω
Transconductance: 0.024 S
Amplification factor: 14
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 25 W
Max screen dissipation: 4 W
Max cathode current: 200 mA

Promoted ratings and characteristics mapped from source tables.

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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate voltage
265 V
AudioOutput;PushPull
Screen voltage
265 V
AudioOutput;PushPull
Control-grid voltage
-12.5 V
AudioOutput;PushPull
Plate current per pair
230 mA
AudioOutput;PushPull
Screen current per pair
54 mA
AudioOutput;PushPull
Plate-to-plate load
24000 Ω
AudioOutput;PushPull
Power output
40 W
AudioOutput;PushPull

Capacitance

Grid-to-plate capacitance
2.4 pF
Section1