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4GJ7
Voltage - Radio Detector Converter Pentode-TriodeDissimilar
PDF Google eBay
Base
9QA
Socket code
B9A
Sections
2
Heater
4.3 V / 600 mA
Plate
S1: 140 V / 1.8 W · S2: 275 V / 2.4 W
Screen
S2: 275 V / 0.55 W
Ik max
S1: 22 mA · S2: 20 mA
rP
S2: 350,000 Ω
gm
S1: 9 mA/V · S2: 11 mA/V
μ
S1: 20
9 pins - B9A - Small-button Noval 9-contact
Variations:4GX7 XCF801
Medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in television receivers.
Frequency Converter Tube Oscillator Tube Pentode Sharp Cutoff Radio Detector Converter Radio Detector Converter Tube TV Receiver Tube
Source PDFs (3)
4GX7
Voltage - Radio Detector Converter Pentode-TriodeDissimilar
PDF Google eBay
Base
Refer to variations
Socket code
B9A
Sections
2
Heater
4.2 V / 600 mA
Plate
S1: 275 V / 1.5 W · S2: 275 V / 2.2 W
Screen
S2: 275 V / 0.45 W
Ik max
S1: 20 mA · S2: 20 mA
rP
S1: 4,700 Ω · S2: 200,000 Ω
gm
S1: 8.5 mA/V · S2: 11 mA/V
μ
S1: 40
9 pins - B9A - Small-button Noval 9-contact
Variations:4GJ7 XCF801
Triode plus frame-grid pentode designed for television frequency-converter service.
Frequency Converter Tube Oscillator Tube Radio Detector Converter Radio Detector Converter Tube TV Receiver Tube
Source PDFs (4)
XCF801
Voltage - Radio Detector Converter Pentode-TriodeDissimilar
PDF Google eBay
Base
9QA
Socket code
B9A
Sections
2
Heater
4.1 V / 600 mA
Plate
S1: 140 V / 1.8 W · S2: 275 V / 2.4 W
Screen
S2: 275 V / 0.55 W
Ik max
S1: 22 mA · S2: 20 mA
rP
S2: 350,000 Ω
gm
S1: 9 mA/V · S2: 11 mA/V
μ
S1: 20
9 pins - B9A - Small-button Noval 9-contact
Variations:4GJ7 4GX7
Medium-mu triode plus sharp-cutoff pentode designed for combined oscillator and mixer service in television receivers.
Designed For VHF Oscillator Tube Radio Detector Converter
Source PDFs (1)
- 1975 RCA RC30 (opens in a new tab)

Electrical Summary

General Summary

4GJ7

Voltage - Radio Detector Converter Pentode-TriodeDissimilar

Heater	4.3 V / 600 mA
Plate	S1: 140 V / 1.8 WS2: 275 V / 2.4 W
Screen	S2: 275 V / 0.55 W
Ik max	S1: 22 mAS2: 20 mA
rP	S2: 350,000 Ω
gm	S1: 9 mA/VS2: 11 mA/V
μ	S1: 20

9 pins - B9A - Small-button Noval 9-contact

Variations:4GX7 XCF801

Medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in television receivers.

Frequency Converter Tube Oscillator Tube Pentode Sharp Cutoff Radio Detector Converter Radio Detector Converter Tube TV Receiver Tube

4GX7

Voltage - Radio Detector Converter Pentode-TriodeDissimilar

Heater	4.2 V / 600 mA
Plate	S1: 275 V / 1.5 WS2: 275 V / 2.2 W
Screen	S2: 275 V / 0.45 W
Ik max	S1: 20 mAS2: 20 mA
rP	S1: 4,700 ΩS2: 200,000 Ω
gm	S1: 8.5 mA/VS2: 11 mA/V
μ	S1: 40

9 pins - B9A - Small-button Noval 9-contact

Variations:4GJ7 XCF801

Triode plus frame-grid pentode designed for television frequency-converter service.

Frequency Converter Tube Oscillator Tube Radio Detector Converter Radio Detector Converter Tube TV Receiver Tube

XCF801

Voltage - Radio Detector Converter Pentode-TriodeDissimilar

Heater	4.1 V / 600 mA
Plate	S1: 140 V / 1.8 WS2: 275 V / 2.4 W
Screen	S2: 275 V / 0.55 W
Ik max	S1: 22 mAS2: 20 mA
rP	S2: 350,000 Ω
gm	S1: 9 mA/VS2: 11 mA/V
μ	S1: 20

9 pins - B9A - Small-button Noval 9-contact

Variations:4GJ7 4GX7

Medium-mu triode plus sharp-cutoff pentode designed for combined oscillator and mixer service in television receivers.

Designed For VHF Oscillator Tube Radio Detector Converter

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