5591

Long-life low-noise RF and broadband pentode developed for professional high-frequency amplifier service and replacement of 5654/6AK5-class types.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: E7-1
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 150 mA

Description

RF and broadband amplifier pentode, described as a long-life replacement for 5654 and 6AK5.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: E7-1
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

E7-1 - 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

Plate resistance: 350000 Ω
Transconductance: 0.0051 S
Amplification factor: 28
Max plate voltage: 200 V
Max screen voltage: 155 V
Max plate dissipation: 1.85 W
Max screen dissipation: 0.5 W

Published maximum ratings and characteristic constants promoted; identical twin sections compressed when applicable.

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 Western Electric Random 2

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Screen voltage, operating condition
120 V
Representative published column

Characteristics

Transconductance, alternate condition
4300 uS
Published alternate operating column
Transconductance, alternate condition
5100 uS
Published alternate operating column

Data set 02

1965 Ericsson Longlife

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate supply voltage
130 V
ClassA
Screen-grid supply voltage
130 V
ClassA
Cathode bias resistor
200 Ohm
ClassA
Plate current
8 mA
ClassA
Screen-grid current
2 mA
ClassA
Transconductance minimum
4000 uS
Transconductance maximum
6200 uS
Plate current maximum
10.8 mA
Screen-grid current maximum
2.7 mA

Characteristics

Transconductance
5100 uS
ClassA
Plate resistance
0.35 MOhm
ClassA
Screen-to-control-grid amplification factor
28 ratio
ClassA
Equivalent noise resistance
1600 Ohm
ClassA
Input conductance at 100 MHz
125 uS
ClassA

Data set 03

196X LM Ericsson

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Heater current
150 mA
Plate resistance
1600 ohm
Transconductance
125 uS
Amplification factor
2

Other

Maximum plate voltage
200 V
Maximum screen voltage
155 V
Maximum plate dissipation
1.85 W