Electronic tube and vacuum tube catalog

Base: 5R
Socket code: UX5
Electrical Summary: Heater 2 V / 60 mA
Plate 180 V
Screen 67.5 V
rP 600,000 Ω
gm 0.65 mA/V
Sections: 1

Heater	2 V / 60 mA
Plate	180 V
Screen	67.5 V
rP	600,000 Ω
gm	0.65 mA/V

5 pins - UX5 - Small 5-contact

Variable-mu or remote-cutoff screen-grid tetrode for controlled RF or IF voltage amplification, permitting smooth receiver gain control over an extended grid-bias range.

Source PDFs (2)

1EE1P

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: —
Electrical Summary: Heater 1 V / 46 mA
μ 1.3
Sections: 1

Heater	1 V / 46 mA
μ	1.3

Russian directly heated electrometric tetrode for very-low-current measurements.

Source PDFs (1)

2026 Russian Receiving (opens in a new tab)

215SG

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: B4
Electrical Summary: Heater 2 V / 150 mA
Plate 150 V
rP 300,000 Ω
gm 1.1 mA/V
Sections: 1

Heater	2 V / 150 mA
Plate	150 V
rP	300,000 Ω
gm	1.1 mA/V

4 pins - B4 - European 4-pin base

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (3)

22

Voltage Tetrode TetrodeDirectly heated

Base: 4K
Socket code: UX4
Electrical Summary: Heater 3.3 V / 132 mA
Plate 135 V
Screen 67.5 V
rP 600,000 Ω
gm 0.48 mA/V
Sections: 1

Heater	3.3 V / 132 mA
Plate	135 V
Screen	67.5 V
rP	600,000 Ω
gm	0.48 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (8)

220SG

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: B4
Electrical Summary: Heater 2 V / 200 mA
Plate 150 V
rP 200,000 Ω
gm 1.6 mA/V
μ 320
Sections: 1

Heater	2 V / 200 mA
Plate	150 V
rP	200,000 Ω
gm	1.6 mA/V
μ	320

4 pins - B4 - European 4-pin base

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Oscillator Tube Tetrode

Source PDFs (3)

220VS

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: B4
Electrical Summary: Heater 2 V / 200 mA
Plate 150 V
rP 400,000 Ω
gm 1.6 mA/V
Sections: 1

Heater	2 V / 200 mA
Plate	150 V
rP	400,000 Ω
gm	1.6 mA/V

4 pins - B4 - European 4-pin base

Variable-mu or remote-cutoff screen-grid tetrode for controlled RF or IF voltage amplification, permitting smooth receiver gain control over an extended grid-bias range.

Source PDFs (3)

220VSG

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: B4
Electrical Summary: Heater 2 V / 200 mA
Plate 150 V
rP 110,000 Ω
gm 1.6 mA/V
Sections: 1

Heater	2 V / 200 mA
Plate	150 V
rP	110,000 Ω
gm	1.6 mA/V

4 pins - B4 - European 4-pin base

Variable-mu or remote-cutoff screen-grid tetrode for controlled RF or IF voltage amplification, permitting smooth receiver gain control over an extended grid-bias range.

Source PDFs (3)

24

Base: —
Socket code: UX5
Electrical Summary: Heater 2.5 V / 1.75 A
Plate 275 V
rP 600,000 Ω
gm 1.05 mA/V
Sections: 1

Heater	2.5 V / 1.75 A
Plate	275 V
rP	600,000 Ω
gm	1.05 mA/V

5 pins - UX5 - Small 5-contact

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (3)

245A

Base: —
Socket code: MEDIUM5
Electrical Summary: Heater 2 V / 1.6 A
Plate 180 V
Screen 67.5 V
rP 110,000 Ω
gm 0.78 mA/V
Sections: 1

Heater	2 V / 1.6 A
Plate	180 V
Screen	67.5 V
rP	110,000 Ω
gm	0.78 mA/V

5 pins - MEDIUM5 - Medium 5-contact transmitting-tube base

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (2)

246A

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: MEDIUM4BAYONET
Electrical Summary: Heater 3.3 V / 100 mA
Plate 180 V
Screen 67.5 V
rP 325,000 Ω
gm 0.51 mA/V
Sections: 1

Heater	3.3 V / 100 mA
Plate	180 V
Screen	67.5 V
rP	325,000 Ω
gm	0.51 mA/V

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (3)

24A

Base: 5E
Socket code: UX5
Electrical Summary: Heater 2.5 V / 1.75 A
Plate 250 V
Screen 90 V
rP 600,000 Ω
gm 1.025 mA/V
Sections: 1

Heater	2.5 V / 1.75 A
Plate	250 V
Screen	90 V
rP	600,000 Ω
gm	1.025 mA/V

5 pins - UX5 - Small 5-contact

Indirectly heated screen-grid tetrode chiefly intended for high-frequency receiver amplification, with manufacturer documentation also supporting detector and audio-frequency voltage-amplifier service.

Source PDFs (11)

24E

Base: —
Socket code: UX5
Electrical Summary: Heater 2.5 V / 1.75 A
rP 600,000 Ω
gm 1 mA/V
Sections: 1

Heater	2.5 V / 1.75 A
rP	600,000 Ω
gm	1 mA/V

5 pins - UX5 - Small 5-contact

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (1)

1948 Brimar Radio Valve Manual (opens in a new tab)

259A

Base: —
Socket code: MEDIUM5
Electrical Summary: Heater 2 V / 1.6 A
Plate 250 V
Screen 90 V
rP 400,000 Ω
gm 1.38 mA/V
μ 550
Sections: 1

Heater	2 V / 1.6 A
Plate	250 V
Screen	90 V
rP	400,000 Ω
gm	1.38 mA/V
μ	550

5 pins - MEDIUM5 - Medium 5-contact transmitting-tube base

Western Electric screen-grid tetrode for high-frequency or audio-frequency voltage amplification and detector service, providing high voltage gain per stage.

Source PDFs (2)

259B

Base: —
Socket code: MEDIUM4BAYONET
Electrical Summary: Heater 2 V / 1.6 A
Plate 250 V
Screen 90 V
rP 400,000 Ω
gm 1.38 mA/V
μ 550
Sections: 1

Heater	2 V / 1.6 A
Plate	250 V
Screen	90 V
rP	400,000 Ω
gm	1.38 mA/V
μ	550

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (3)

283A

Base: —
Socket code: MEDIUM5
Electrical Summary: Heater 2 V / 1.6 A
Plate 250 V
Screen 75 V
Ik max 6 mA
rP 700,000 Ω
gm 1.4 mA/V
μ 980
Sections: 1

Heater	2 V / 1.6 A
Plate	250 V
Screen	75 V
Ik max	6 mA
rP	700,000 Ω
gm	1.4 mA/V
μ	980

5 pins - MEDIUM5 - Medium 5-contact transmitting-tube base

Western Electric variable-mu screen-grid tetrode for controlled high-frequency and audio-frequency voltage amplification, using extended cutoff for receiver gain regulation.

Source PDFs (2)

2CY5

Designed For VHF Sharp Cutoff Television RF Amplifier Video Amplifier Tube

Base: 7EW
Socket code: B7G
Electrical Summary: Heater 2.4 V / 600 mA
Plate 180 V / 2 W
Screen 180 V / 0.5 W
Ik max 20 mA
rP 125,000 Ω
gm 8 mA/V
Sections: 1

Heater	2.4 V / 600 mA
Plate	180 V / 2 W
Screen	180 V / 0.5 W
Ik max	20 mA
rP	125,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

VHF tetrode designed as the RF amplifier in television tuners, providing high-frequency gain with controlled cutoff characteristics for front-end receiver service.

Source PDFs (10)

2EA5

Sharp Cutoff Tetrode Sharp Cutoff

Base: —
Socket code: B7G
Electrical Summary: Heater 2.4 V / 600 mA
Plate 250 V / 3.25 W
Screen 150 V / 0.5 W
Ik max 20 mA
rP 150,000 Ω
gm 8 mA/V
Sections: 1

Heater	2.4 V / 600 mA
Plate	250 V / 3.25 W
Screen	150 V / 0.5 W
Ik max	20 mA
rP	150,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

Sharp-cutoff screen-grid tetrode intended primarily for RF voltage amplification, providing high gain with comparatively abrupt cutoff characteristics.

Source PDFs (3)

2EV5

Designed For VHF Frame Grid Sharp Cutoff Television RF Amplifier Video Amplifier Tube

Base: —
Socket code: B7G
Electrical Summary: Heater 2.4 V / 600 mA
Plate 275 V / 3.25 W
Screen 180 V / 0.2 W
Ik max 20 mA
rP 150,000 Ω
gm 8.8 mA/V
Sections: 1

Heater	2.4 V / 600 mA
Plate	275 V / 3.25 W
Screen	180 V / 0.2 W
Ik max	20 mA
rP	150,000 Ω
gm	8.8 mA/V

7 pins - B7G - Miniature 7-contact

VHF tetrode designed as the RF amplifier in television tuners, providing high-frequency gain with controlled cutoff characteristics for front-end receiver service.

Source PDFs (5)

2FV6

Designed For VHF Frame Grid Sharp Cutoff Television RF Amplifier Video Amplifier Tube

Base: —
Socket code: B7G
Electrical Summary: Heater 2.4 V / 600 mA
Plate 250 V / 4.5 W
Screen 180 V / 0.5 W
Ik max 20 mA
rP 100,000 Ω
gm 8 mA/V
Sections: 1

Heater	2.4 V / 600 mA
Plate	250 V / 4.5 W
Screen	180 V / 0.5 W
Ik max	20 mA
rP	100,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

VHF tetrode designed as the RF amplifier in television tuners, providing high-frequency gain with controlled cutoff characteristics for front-end receiver service.

Source PDFs (4)

2NE9

Voltage Tetrode TetrodeDirectly heated

Electrometer Tube Instrumentation Tube

Base: —
Socket code: —
Electrical Summary: Heater 1.2 V / 29 mA
Plate 10 V
Sections: 1

Heater	1.2 V / 29 mA
Plate	10 V

Directly heated oxide-cathode electrometer tetrode intended for precision measuring applications requiring extremely small currents and sensitive DC signal amplification.

Source PDFs (2)

30F27

Designed For VHF Frame Grid Remote Cutoff Television RF Amplifier Video Amplifier Tube

Base: B9A
Socket code: B9A
Electrical Summary: Heater 37 V / 300 mA
Plate 250 V / 2.5 W
Screen 230 V / 0.4 W
Ik max 18 mA
gm 15 mA/V
μ 60
Sections: 1

Heater	37 V / 300 mA
Plate	250 V / 2.5 W
Screen	230 V / 0.4 W
Ik max	18 mA
gm	15 mA/V
μ	60

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

Variable-mu frame-grid VHF tetrode designed for television turret-tuner RF amplification, combining high-frequency gain with controlled cutoff for receiver gain regulation.

Source PDFs (2)

32

Voltage Tetrode TetrodeDirectly heated

Base: 4K
Socket code: UX4
Electrical Summary: Heater 2 V / 60 mA
Plate 180 V
Screen 67.5 V
rP 1,200,000 Ω
gm 0.64 mA/V
μ 780
Sections: 1

Heater	2 V / 60 mA
Plate	180 V
Screen	67.5 V
rP	1,200,000 Ω
gm	0.64 mA/V
μ	780

4 pins - UX4 - Medium-shell UX 4-contact

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (13)

322

Base: —
Socket code: UX4
Electrical Summary: Heater 6.3 V / 950 mA
Plate 180 V / 15 W
Screen 67.5 V
gm 0.5 mA/V
Sections: 1

Heater	6.3 V / 950 mA
Plate	180 V / 15 W
Screen	67.5 V
gm	0.5 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (2)

332

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: —
Electrical Summary: Heater 2 V / 60 mA
Plate 180 V
Screen 67.5 V
gm 0.78 mA/V
Sections: 1

Heater	2 V / 60 mA
Plate	180 V
Screen	67.5 V
gm	0.78 mA/V

4 pins

Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.

Source PDFs (0)

No source PDFs available.

35

Base: 5E
Socket code: UX5
Electrical Summary: Heater 2.5 V / 1.75 A
Plate 250 V
Screen 90 V
rP 400,000 Ω
gm 1.05 mA/V
μ 420
Sections: 1

Heater	2.5 V / 1.75 A
Plate	250 V
Screen	90 V
rP	400,000 Ω
gm	1.05 mA/V
μ	420

5 pins - UX5 - Small 5-contact

Variations:51

Variable-mu or remote-cutoff screen-grid tetrode for controlled RF or IF voltage amplification, permitting smooth receiver gain control over an extended grid-bias range.

Source PDFs (12)

36

Sharp Cutoff Tetrode Sharp Cutoff

Base: 5E
Socket code: UX5
Electrical Summary: Heater 6.3 V / 300 mA
Plate 180 V
Screen 90 V
rP 550,000 Ω
gm 1.08 mA/V
μ 595
Sections: 1

Heater	6.3 V / 300 mA
Plate	180 V
Screen	90 V
rP	550,000 Ω
gm	1.08 mA/V
μ	595

5 pins - UX5 - Small 5-contact

Sharp-cutoff screen-grid tetrode intended primarily for RF voltage amplification, providing high gain with comparatively abrupt cutoff characteristics.

Source PDFs (13)

3CY5

Designed For VHF Sharp Cutoff Television RF Amplifier Video Amplifier Tube

Base: 7EW
Socket code: B7G
Electrical Summary: Heater 2.9 V / 600 mA
Plate 180 V / 2 W
Screen 180 V / 0.5 W
Ik max 20 mA
rP 125,000 Ω
gm 8 mA/V
Sections: 1

Heater	2.9 V / 600 mA
Plate	180 V / 2 W
Screen	180 V / 0.5 W
Ik max	20 mA
rP	125,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

VHF tetrode designed as the RF amplifier in television tuners, providing high-frequency gain with controlled cutoff characteristics for front-end receiver service.

Source PDFs (9)

3EA5

Designed For VHF Tetrode TV Receiver Tube

Base: —
Socket code: B7G
Electrical Summary: Heater 2.9 V / 450 mA
Plate 250 V / 3.25 W
Screen 150 V / 0.5 W
Ik max 20 mA
rP 150,000 Ω
gm 8 mA/V
Sections: 1

Heater	2.9 V / 450 mA
Plate	250 V / 3.25 W
Screen	150 V / 0.5 W
Ik max	20 mA
rP	150,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

Sharp-cutoff tetrode for high-plate-voltage RF amplification in VHF television tuners. Its high output resistance and controlled cutoff suit low-level tuner front ends.

Source PDFs (3)

3EV5

Designed For Low Noise Designed For VHF Low Noise Tube Tetrode TV Receiver Tube

Base: —
Socket code: B7G
Electrical Summary: Heater 2.9 V / 450 mA
Plate 275 V / 3.25 W
Screen 180 V / 0.2 W
Ik max 20 mA
rP 150,000 Ω
gm 8.8 mA/V
Sections: 1

Heater	2.9 V / 450 mA
Plate	275 V / 3.25 W
Screen	180 V / 0.2 W
Ik max	20 mA
rP	150,000 Ω
gm	8.8 mA/V

7 pins - B7G - Miniature 7-contact

High-gain sharp-cutoff tetrode for low-noise VHF television tuner service. Its design emphasizes sensitive RF amplification ahead of the converter stage.

Source PDFs (5)

4066

Voltage Tetrode TetrodeDirectly heated

Instrumentation Tube Subminiature Wire Leaded Tetrode

Base: —
Socket code: B8D
Electrical Summary: Heater 1.25 V / 13 mA
Plate 10 V
Ik max 0.3 mA
gm 0.017 mA/V
Sections: 1

Heater	1.25 V / 13 mA
Plate	10 V
Ik max	0.3 mA
gm	0.017 mA/V

8 pins - B8D - Subminiature 8-lead

Directly heated subminiature electrometer tetrode for very-low-current measurement. Extremely low filament power and high input resistance suit sensitive instrumentation.

Source PDFs (4)

435A

Base: —
Socket code: B9A
Electrical Summary: Heater 6.3 V / 300 mA
Plate 190 V / 3 W
Screen 160 V / 0.75 W
Ik max 36 mA
rP 13,000 Ω
gm 15.5 mA/V
Sections: 1

Heater	6.3 V / 300 mA
Plate	190 V / 3 W
Screen	160 V / 0.75 W
Ik max	36 mA
rP	13,000 Ω
gm	15.5 mA/V

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

High figure-of-merit amplifier tetrode for high-frequency signal amplification. Its construction emphasizes useful gain and performance at elevated radio frequencies.

Designed For VHF Tetrode

Source PDFs (1)

2026 Western Electric 400s (opens in a new tab)

436A

Base: —
Socket code: B9A
Electrical Summary: Heater 6.3 V / 450 mA
Plate 190 V / 4.5 W
Screen 160 V / 2 W
Ik max 72 mA
rP 36,000 Ω
gm 3 mA/V
Sections: 1

Heater	6.3 V / 450 mA
Plate	190 V / 4.5 W
Screen	160 V / 2 W
Ik max	72 mA
rP	36,000 Ω
gm	3 mA/V

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

High figure-of-merit amplifier tetrode for high-frequency signal amplification. Its increased heater power supports strong performance in demanding RF circuits.

Designed For VHF Tetrode

Source PDFs (1)

2026 Western Electric 400s (opens in a new tab)

448A

Base: —
Socket code: UX4
Electrical Summary: Heater 6.3 V / 450 mA
Plate 150 V / 6 W
Screen 150 V / 1.75 W
Ik max 50 mA
rP 33,000 Ω
gm 31.5 mA/V
Sections: 1

Heater	6.3 V / 450 mA
Plate	150 V / 6 W
Screen	150 V / 1.75 W
Ik max	50 mA
rP	33,000 Ω
gm	31.5 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

High figure-of-merit indirectly heated tetrode developed for the Western Electric TH radio-relay system, providing high-frequency amplification in professional communications equipment.

Repeater Tube Tetrode

Source PDFs (1)

2026 Western Electric 400s (opens in a new tab)

448B

Base: —
Socket code: UX4
Electrical Summary: Heater 6.3 V / 450 mA
Plate 150 V / 6 W
Screen 150 V / 1.75 W
Ik max 50 mA
rP 33,000 Ω
gm 31.5 mA/V
Sections: 1

Heater	6.3 V / 450 mA
Plate	150 V / 6 W
Screen	150 V / 1.75 W
Ik max	50 mA
rP	33,000 Ω
gm	31.5 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

High figure-of-merit indirectly heated tetrode for the Western Electric TH radio-relay system, intended for professional high-frequency repeater amplification.

Repeater Tube Tetrode

Source PDFs (1)

2026 Western Electric 400s (opens in a new tab)

454A

Base: —
Socket code: UX4
Electrical Summary: Heater 6.3 V / 450 mA
Plate 150 V / 6 W
Screen 150 V / 1.75 W
Ik max 50 mA
rP 33,000 Ω
gm 31.5 mA/V
Sections: 1

Heater	6.3 V / 450 mA
Plate	150 V / 6 W
Screen	150 V / 1.75 W
Ik max	50 mA
rP	33,000 Ω
gm	31.5 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

High figure-of-merit indirectly heated tetrode for the Western Electric TH radio-relay system, providing specialized amplification in professional communications links.

Repeater Tube Tetrode

Source PDFs (1)

2026 Western Electric 400s (opens in a new tab)

48

Named For Audio Output Power Tetrode

Base: 6A
Socket code: UX6
Electrical Summary: Heater 30 V / 400 mA
Plate 125 V
Screen 100 V
Ik max 65.5 mA
gm 3.9 mA/V
μ 15.6
Sections: 1

Heater	30 V / 400 mA
Plate	125 V
Screen	100 V
Ik max	65.5 mA
gm	3.9 mA/V
μ	15.6

6 pins - UX6 - Small 6-contact

Power-amplifier tetrode for low-voltage Class A output service. Published operating data provide about 2.5 watts output from a 125-volt plate supply.

Source PDFs (6)

49

Voltage Tetrode TetrodeDirectly heated

Named For Audio Output Power Tetrode

Base: 5C
Socket code: UX5
Electrical Summary: Heater 2 V / 120 mA
Plate 135 V
Ik max 50 mA
rP 4,175 Ω
gm 1.125 mA/V
μ 4.7
Sections: 1

Heater	2 V / 120 mA
Plate	135 V
Ik max	50 mA
rP	4,175 Ω
gm	1.125 mA/V
μ	4.7

5 pins - UX5 - Small 5-contact

Directly heated dual-grid power-amplifier tube for low-power Class A output service. Its economical two-volt filament suits battery-operated receiving equipment.

Source PDFs (9)

4A137B

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: B5
Electrical Summary: Heater 5 V / 1.6 A
Plate 250 V
rP 3,600 Ω
μ 5.3
Sections: 1

Heater	5 V / 1.6 A
Plate	250 V
rP	3,600 Ω
μ	5.3

5 pins - B5 - European 5-pin base

Directly heated tetrode with a heavy five-volt filament. Available source material confirms tetrode construction but does not establish a narrower functional application confidently.

Source PDFs (2)

4AI37B

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: B5
Electrical Summary: Heater 5 V / 1.6 A
Plate 250 V
Ik max 45 mA
rP 3,600 Ω
μ 5.3
Sections: 1

Heater	5 V / 1.6 A
Plate	250 V
Ik max	45 mA
rP	3,600 Ω
μ	5.3

5 pins - B5 - European 5-pin base

Directly heated coplanar-grid tetrode with a heavy five-volt filament. Available source material identifies its specialized grid geometry without establishing a narrower functional category.

Source PDFs (1)

1947 Standard Valves (opens in a new tab)

4CY5

Designed For VHF Tetrode TV Receiver Tube

Base: 7FT
Socket code: B7G
Electrical Summary: Heater 4.5 V / 300 mA
Plate 180 V / 3 W
Screen 180 V / 0.5 W
Ik max 40 mA
rP 100,000 Ω
gm 8 mA/V
Sections: 1

Heater	4.5 V / 300 mA
Plate	180 V / 3 W
Screen	180 V / 0.5 W
Ik max	40 mA
rP	100,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

Sharp-cutoff tetrode for VHF television-tuner RF amplification. Its high-frequency characteristics suit sensitive front-end amplification in television receivers.

Source PDFs (6)

4NE9

Voltage Tetrode TetrodeDirectly heated

Instrumentation Tube Tetrode

Base: —
Socket code: —
Electrical Summary: Heater 1.25 V / 26 mA
Plate 12 V
Sections: 1

Heater	1.25 V / 26 mA
Plate	12 V

Directly heated electrometer tetrode intended for very-low-current measurement. Its low-power filament and high input resistance suit sensitive instrumentation circuits.

Source PDFs (2)

51

Base: 5E
Socket code: UX5
Electrical Summary: Heater 2.5 V / 1.75 A
Plate 275 V
Screen 90 V
rP 400,000 Ω
gm 1.05 mA/V
Sections: 1

Heater	2.5 V / 1.75 A
Plate	275 V
Screen	90 V
rP	400,000 Ω
gm	1.05 mA/V

5 pins - UX5 - Small 5-contact

Variations:35

Tetrode documented in Raytheon receiving-tube sources. Available manufacturer material in the current record does not establish a narrower functional application confidently enough for recategorization.

Source PDFs (3)

52

Voltage Tetrode TetrodeDirectly heated

Base: —
Socket code: U7B
Electrical Summary: Heater 6.3 V / 300 mA
Plate 180 V
Sections: 1

Heater	6.3 V / 300 mA
Plate	180 V

5 pins - U7B - Medium 7-contact

Directly heated tetrode documented in Raytheon receiving-tube sources. Available material confirms tetrode construction but does not establish a narrower functional role confidently.

Source PDFs (1)

1937 Raytheon Radio Receiving Tubes (opens in a new tab)

5800

Voltage Tetrode TetrodeDirectly heated

Instrumentation Tube Subminiature Wire Leaded Tetrode

Base: —
Socket code: B9A
Electrical Summary: Heater 1.25 V / 10 mA
Plate 25 V
Sections: 1

Heater	1.25 V / 10 mA
Plate	25 V

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

Subminiature low-filament-power tetrode designed as an electrometer amplifier. Very high input resistance and tiny heater demand suit sensitive portable instrumentation.

Source PDFs (2)

6250

Voltage Tetrode TetrodeDirectly heated

Instrumentation Tube Space Charge Grid Tetrode

Base: —
Socket code: B9A
Electrical Summary: Heater 2.56 V / 45 mA
Plate 9 V
gm 0.04 mA/V
μ 1.8
Sections: 1

Heater	2.56 V / 45 mA
Plate	9 V
gm	0.04 mA/V
μ	1.8

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

Directly heated space-charge-grid electrometer tetrode for extremely high input-resistance measurement circuits. Its specialized grid arrangement supports very-low-current instrumentation.

Source PDFs (5)

6CY5

Designed For VHF Tetrode TV Receiver Tube

Base: 7EW
Socket code: B7G
Electrical Summary: Heater 6.3 V / 200 mA
Plate 180 V / 2 W
Screen 180 V / 0.5 W
Ik max 20 mA
rP 100,000 Ω
gm 8 mA/V
Sections: 1

Heater	6.3 V / 200 mA
Plate	180 V / 2 W
Screen	180 V / 0.5 W
Ik max	20 mA
rP	100,000 Ω
gm	8 mA/V

7 pins - B7G - Miniature 7-contact

Sharp-cutoff tetrode for VHF television-tuner RF amplification. Its high output resistance and controlled cutoff suit sensitive tuner front ends.

Source PDFs (15)

6CY5CATV

Base: —
Socket code: —
Electrical Summary: -
Sections: 1

7 pins

Ericsson long-life seven-pin sharp-cutoff RF tetrode developed for dependable amplification in cable-television (CATV) distribution equipment, with rugged miniature construction and shielded interelectrode capacitances.

Source PDFs (1)

1965 Ericsson Longlife (opens in a new tab)

6E15P

High Voltage Tube Russian Tube Tetrode

Base: —
Socket code: B9A
Electrical Summary: Heater 6.3 V / 625 mA
Plate 5,000 V / 10 W
Screen 60 V / 0.15 W
gm 0.7 mA/V
Sections: 1

Heater	6.3 V / 625 mA
Plate	5,000 V / 10 W
Screen	60 V / 0.15 W
gm	0.7 mA/V

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

Russian high-voltage tetrode designed for specialized high-voltage electronic service. Available translated source material supports the high-voltage role without a more specific functional assignment.

Source PDFs (2)

6E5PE