9D7

High-slope Brimar variable-mu RF pentode designed for television and FM IF stages using automatic gain control. It combines substantial transconductance with controlled cutoff for wideband gain-regulated amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

The BRIMAR 9D7 is a high-slope vari-mu RF pentode for television and FM IF stages using automatic gain control.

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: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

Transconductance: 0.0084 S
Max plate voltage: 275 V
Max screen voltage: 275 V
Max plate dissipation: 2.75 W
Max screen dissipation: 1.2 W
Max cathode current: 30 mA

High-slope vari-mu RF pentode.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Anode Voltage
250 V
Screen Voltage
100 V
Anode Current
10 mA
Screen Current
3.3 mA
Cathode Bias Resistor
100 ohm