7745

Beam-power audio-output tube intended for substantial low-frequency power amplification, providing high current and useful output for professional or consumer amplifier equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7E-UA
Socket code: B9A
Base pins: 7
Nominal heater: 12.6 V / 3.6 A

Description

Dual transmitting tetrode for RF power amplification, with both sections intended for parallel operation.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7E-UA
Socket code: B9A
Base pins: 7
Nominal heater voltage: 12.6 V
Nominal heater current: 3.6 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7E-UA - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 800 V
Max screen voltage: 350 V
Max plate dissipation: 60 W
Max screen dissipation: 15 W
Max grid dissipation: 2 W

Representative row for two electrically identical beam-tetrode sections; dissipation is per element.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 800 V
Max screen voltage: 350 V
Max plate dissipation: 60 W
Max screen dissipation: 15 W

Second identical physical beam-power/tetrode element; added to align rows with SectionCount.

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

Anode Grid Capacitance
0.5 pF
Input Capacitance
26 pF
Output Capacitance
19 pF

Other

Maximum Frequency
80 MHz
ParallelElementTypicalPlateVoltage
750 V
ParallelElementTypicalScreenVoltage
300 V
ParallelElementOutputPower
200 W