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Voltage Radio Detector Converter ·Pentode

77

Classic sharp-cutoff pentode explicitly designed for radio RF amplification and detector service. Its high plate resistance provides substantial gain while manufacturer literature supports detector operation as a primary receiver function.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Fixed-slope RF pentode amplifier and detector.

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: 1000000 Ω
Transconductance: 0.00125 S
Max plate voltage: 300 V
Max screen voltage: 100 V
Max plate dissipation: 0.75 W
Max screen dissipation: 0.1 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
100 V
ClassA
Screen voltage
60 V
ClassA
Control-grid voltage
-1.5 V
ClassA
Plate current
1.7 mA
ClassA
Screen current
0.4 mA
ClassA
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
2.3 mA
ClassA
Screen current
0.6 mA
ClassA
Plate supply voltage
100 V
BiasedDetector
Screen voltage
36 V
BiasedDetector
Cathode resistor
12500 Ω
BiasedDetector
Cathode current
0.155 mA
BiasedDetector;NoSignal
Plate supply voltage
250 V
BiasedDetector
Screen voltage
100 V
BiasedDetector
Cathode resistor
10000 Ω
BiasedDetector
Cathode current
0.43 mA
BiasedDetector;NoSignal

Characteristic

Plate resistance
650000 Ω
100VPlate
Transconductance
1100 µS
100VPlate
Plate resistance
1500000 Ω
250VPlate
Transconductance
1250 µS
250VPlate

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
BiasedDetector_Amplifier text

Data set 03

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
100 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
2.3 mA
ClassA
Screen current
0.5 mA
ClassA

Characteristic

Plate resistance
1000000 ohm
Published handbook characteristic
Transconductance
1250 µS
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid To Cathode Capacitance
4.7 pF
Plate To Cathode Capacitance
11 pF
Grid To Plate Capacitance
0.007 pF
Maximum