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Voltage Pentode - Sharp Cutoff (single) ·Pentode

954

Acorn sharp-cutoff pentode designed for high-frequency amplifier service to approximately 430 MHz. Its compact acorn construction minimizes lead lengths for fixed-gain VHF/UHF signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 5BB
Socket code: ACORN7
Base pins: 7
Nominal heater: 6.3 V / 150 mA

Description

Acorn sharp-cutoff pentode for high-frequency amplifier service to about 430 MHz.

Socket description

Acorn radial 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 5BB
Socket code: ACORN7
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

5BB - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1H	—	H — Heater EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB
PIN2G2	A	G2 — Screen Grid EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB
PIN3G3	A	G3 — Suppressor Grid EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB
PIN4H	—	H — Heater EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB
PIN5K	A	K — Cathode EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB
CAP1G1	A	G1 — Control Grid EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB
CAP2P	A	P — Plate (Anode) EIA chart transcription; manufacturer corroboration pending	Unverified EIA Base Connections, printed page 127, 5BB

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0011 S
Max plate voltage: 250 V
Max screen voltage: 100 V
Max plate dissipation: 0.5 W
Max screen dissipation: 0.1 W

First published Class-A operating point used for promoted characteristics.

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

1938 RCA Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
150 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Screen Voltage
100 V

Characteristic

Transconductance
1400 µS
Typical

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
250 V
Published handbook rating
Maximum screen voltage
100 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
2 mA
ClassA
Screen current
0.7 mA
ClassA

Characteristic

Plate resistance
1000000 ohm
Published handbook characteristic
Transconductance
1400 µS
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
150 mA
Published heater/filament rating

Data set 03

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
UHFAmplifier
Control-grid voltage
-3 V
UHFAmplifier
Screen voltage
100 V
UHFAmplifier
Plate current
2 mA
UHFAmplifier
Screen current
0.7 mA
UHFAmplifier

Characteristic

Plate resistance minimum
1 MΩ
Section1
Transconductance
1400 µS
Section1

Data set 04

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
150 mA
MaximumOperatingFrequency
430 MHz
Approximate/useful limit
Application
Sharp-cutoff UHF amplifier

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Heater current
150 mA
Plate current
1.2 mA
ClassA;Vp=90V
Screen current
0.5 mA
ClassA;Vp=90V

Capacitance

Control-grid-to-cathode capacitance
3 pF
Plate-to-cathode capacitance
3.4 pF
Grid-to-plate capacitance maximum
0.007 pF
ShieldBaffle