Alternatives & variations Download PDF datasheet

Tuning Indicator ·Triode-TuningIndicator

6U5

Circular electron-ray tuning indicator with integral remote-cutoff triode amplifier, producing a variable fluorescent shadow for accurate receiver tuning.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 6R
Socket code: UX6
Base pins: 6
Nominal heater: 6.3 V / 300 mA

Description

Circular fluorescent tuning indicator with an internally connected remote-cutoff triode amplifier; source is double-marked 6U5/6G5.

Socket description

Small 6-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 6R
Socket code: UX6
Base pins: 6
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

6R - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 127, 6R
PIN2D	A	OTHER — Other Identified Element Source D denotes deflecting electrode; generic OTHER element 40 pending canonical refinement	Unverified EIA Base Connections, printed page 127, 6R
PIN3G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 127, 6R
PIN4T	A	T — Target EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 127, 6R
PIN5K	A	K — Cathode EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 127, 6R
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 127, 6R

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Max plate voltage: 285 V
Max plate dissipation: 1 W

Internal remote-cutoff triode amplifier section of the tuning indicator.

Section 2

Tuning Indicator

X-ray radiationInterelectrode capacitances

Max plate voltage: 285 V

Electron-ray tuning-indicator section; canonical SectionType fallback Other.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Other

Plate supply voltage maximum
250 V
TuningIndicator
Target voltage maximum
250 V
TuningIndicator
Target voltage minimum
90 V
TuningIndicator
Plate supply voltage
100 V
TuningIndicator
Target voltage
100 V
TuningIndicator
Plate resistor
0.5 MΩ
TuningIndicator
Target current
4.5 mA
TuningIndicator
Plate current
0.19 mA
ZeroBias
Grid bias
-8 V
Shadow0Degrees
Plate supply voltage
250 V
TuningIndicator
Target voltage
250 V
TuningIndicator
Plate resistor
1 MΩ
TuningIndicator
Target current
4.5 mA
TuningIndicator
Plate current
0.24 mA
ZeroBias
Grid bias
-22 V
Shadow0Degrees
Grid bias
0 V
Shadow90Degrees

Data set 02

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Other

, l Heater Current
300 mA
, l Heater Current 0,3 amp
f Maxirmm Plate Supply Voltage
2860 V
f Maxirmm Plate Supply Voltage 2860 volts
J DU t»m Maximm Target Voltage
250 V
J DU t»m Maximm Target Voltage 250 volts
Plate Supply Voltage 100 200
260 V
Plate Supply Voltage 100 200 260 volts
Grid Blas (approximate) 0 0
0 V
Grid Blas (approximate) 0 0 0 volts
Heater voltage (&ac or dc), . e e o o s
6.3 V
Heater voltage (&ac or dc), . e e o o s 6,3 volts
Heater current , ., . . . . . ¢« « o o o
300 mA
Heater current , ., . . . . . ¢« « o o o 0,300ampere
v HeatGrVOlmge............... 6.3
6.3 V
v HeatGrVOlmge............... 6.3 6.3 volts
Series triode-plate resistor , . . . . . . 1
1 MΩ
Series triode-plate resistor , . . . . . . 1 1 megohm

Data set 03

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Characteristic

Heater Voltage
6.3 V
Heater Current
300 mA

Other

TargetSupplyVoltage
250 V
ControlGridVoltageForZeroShadow
-22 V

Data set 04

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Characteristics

Triode plate current maximum
0.24 mA

Other

Shadow-angle control grid voltage
-22 V

Data set 05

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Characteristic

Heater Voltage
6.3 V
Heater Current
300 mA

Data set 06

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Other

Maximum target voltage
285 V
TuningIndicator
Minimum target voltage
125 V
TuningIndicator
Plate voltage
250 V
TuningIndicator; Through1Megohm
Target voltage
250 V
TuningIndicator
Plate current
0.24 mA
TuningIndicator
Target current
4 mA
TuningIndicator

Characteristics

Grid voltage for closed shadow
-22 V
TuningIndicator
Grid voltage for open shadow
0 V
TuningIndicator

Data set 07

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate and target supply voltage
250 V
Typical

Characteristic

Grid voltage for zero-degree shadow
-22 V
250V
Plate current at grid 0 V
0.24 mA
250V

SECTION 2

Tuning Indicator

Characteristic

Target current at grid 0 V
4 mA
250V

Other

Maximum target voltage
285 V
Minimum target voltage
100 V