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Voltage Pentode - Remote Cutoff (single) ·Pentode

78

Variable-mu RF pentode amplifier with remote-cutoff characteristics. Designed for Class A receiver service, its extended-control characteristic supports automatic volume control while maintaining high-frequency signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8F
Socket code: UX6
Base pins: 6
Nominal heater: 6.3 V / 300 mA

Description

A variable-mu pentode amplifier for RF service, with remote-cutoff characteristics and Class A operating data.

Socket description

Small 6-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8F
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

8F - 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: 600000 Ω
Transconductance: 0.00165 S
Max plate voltage: 300 V
Max screen voltage: 125 V
Max plate dissipation: 2.75 W
Max screen dissipation: 0.35 W

Published ratings and characteristics mapped semantically; identical repeated sections compressed.

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 1

Pentode

Capacitance

Grid-to-plate capacitance
0.007 pF
Section1
Input capacitance
4 pF
Section1
Output capacitance
11 pF
Section1

Other

Plate voltage
90 V
ClassA
Screen voltage
20 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
5.4 mA
ClassA
Screen current
1.3 mA
ClassA
Plate voltage
180 V
ClassA
Screen voltage
75 V
ClassA
Plate current
4 mA
ClassA
Screen current
1 mA
ClassA
Plate voltage
250 V
ClassA
Screen voltage
125 V
ClassA
Plate current
10.5 mA
ClassA
Screen current
2.8 mA
ClassA
Plate voltage
250 V
Mixer
Screen voltage
100 V
Mixer
Control-grid voltage
-10 V
Mixer

Characteristic

Plate resistance
316000 Ω
90VPlate
Transconductance
1275 µS
90VPlate
Plate resistance
1000000 Ω
180VPlate
Transconductance
1100 µS
180VPlate
Plate resistance
600000 Ω
250VPlate
Transconductance
1650 µS
250VPlate

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
RF_IF_Amplifier text

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater Current
300 mA
Nominal published value

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Cutoff characteristic
Variable-mu

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
300 V
Published handbook rating
Maximum screen voltage
150 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
125 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
10.5 mA
ClassA
Screen current
2.6 mA
ClassA

Characteristic

Plate resistance
600000 ohm
Published handbook characteristic
Transconductance
1650 µS
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 06

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

ControlGridToCathodeCapacitance
4.5 pF
Plate To Cathode Capacitance
11 pF
ControlGridToPlateCapacitance
0.007 pF
Maximum