1F7G

Battery double-diode pentode for detector, AVC, and voltage-amplifier service. Two diode sections recover the signal and develop control voltage while the high-resistance pentode supplies subsequent amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 2 V / 60 mA

Description

Octal-base co-designation of the 1F6 dual-diode pentode for detection, AVC and RF/IF or AF amplification.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 2 V
Nominal heater current: 60 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical section represented from published tube construction and section-specific data.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical section represented from published tube construction and section-specific data.

Section 3

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.00065 S
Amplification factor: 650
Max plate voltage: 180 V
Max screen voltage: 67.5 V

Electrical section reconstructed from published ratings/characteristics; promoted transconductance normalized to A/V.

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 3

Pentode

Other

SMALL Maximum Plate Voltage
180 V
Published ratings
OCTAL BASE Maximum Screen Voltage
67.5 V
Published ratings
Plate Voltage
180 V
ClassA
Screen Voltage
67.5 V
ClassA
Grid Bias «
1 V
ClassA; Column1
Grid Bias «
5 V
ClassA; Column2
Amplification Factor (approximate
650
ClassA
Transconductance
650 uS
ClassA
Plate Current
2 mA
ClassA
Screen Current
0.6 mA
ClassA
Signal Peak Voltage
0.64
ClassA; Column1
Signal Peak Voltage
0.63
ClassA; Column2
Signal Peak Voltage
0.62
ClassA; Column3
No-Signal Plate Current
0.42 mA
ClassA; Column1
No-Signal Plate Current
0.42 mA
ClassA; Column2
No-Signal Plate Current
0.42 mA
ClassA; Column3
Max-Signal Plate Current
0.34 mA
ClassA; Column1
Max-Signal Plate Current
0.34 mA
ClassA; Column2
Max-Signal Plate Current
0.34 mA
ClassA; Column3
Total Harmonic Distortion
5 %
ClassA; Column1
Total Harmonic Distortion
5 %
ClassA; Column2
Total Harmonic Distortion
5 %
ClassA; Column3
Total Harmonic Distortion
5 %
ClassA; Column4
Total Harmonic Distortion
5 %
ClassA; Column5
Total Harmonic Distortion
5 %
ClassA; Column6

Capacitance

Grid to Plate {with tubs shileld
0.007
Published capacitance
Input
4 pF
Published capacitance
Output
9
Published capacitance

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 3

Pentode

Other

Plate Voltage
180 V
Pentode; RF/IF
Screen Voltage
67.5 V
Pentode; RF/IF
Plate Current
2.2 mA
Pentode; RF/IF

Capacitance

Grid-to-Plate Capacitance
0.007 pF
Pentode