6HU6

Electron-ray audio-level indicator designed specifically for tape recorders, providing a fluorescent visual display of changing recording signal level.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Electron-ray audio-level indicator designed especially for tape recorders.

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

2 physical sections, each with unique specifications.

Section 1

Tuning Indicator

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published typical operating conditions, UHF/deflection ratings, and descriptive application reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Internal control/amplifier triode section; added during tuning-indicator physical-section reconciliation.

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

Tuning Indicator

Other

Plate and target supply voltage
250 V
AudioLevelIndicator
Target current
2 mA
AudioLevelIndicator
Series resistance
0.1 MΩ
AudioLevelIndicator
Application
Audio-level indicator for tape recorders
Section1

Characteristic

Grid bias end of control range
-10 V
AudioLevelIndicator