Voltage Tetrode vacuum tubes

Tetrode

Sylvania directly heated ultra-low-current tetrode for precision DC voltage amplification, intended to operate with careful electrical and light shielding in electrometer-class measurements.

Base

Not recorded

Socket

UX4

Heater

0.9 V

Sections

1

Tetrode

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.

Base

5R

Socket

UX5

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

Not recorded

Heater

1 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B4

Heater

2 V

Sections

1

Tetrode

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

Base

4K

Socket

UX4

Heater

3.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B4

Heater

2 V

Sections

1

Tetrode

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.

Base

Not recorded

Socket

B4

Heater

2 V

Sections

1

Tetrode

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.

Base

Not recorded

Socket

B4

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

UX5

Heater

2.5 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

MEDIUM5

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

3.3 V

Sections

1

Tetrode

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

Base

5E

Socket

UX5

Heater

2.5 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

UX5

Heater

2.5 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

MEDIUM5

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

MEDIUM5

Heater

2 V

Sections

1

Tetrode

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

Base

7EW

Socket

B7G

Heater

2.4 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B7G

Heater

2.4 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B7G

Heater

2.4 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B7G

Heater

2.4 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

Not recorded

Heater

1.2 V

Sections

1

Tetrode

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

Base

B9A

Socket

B9A

Heater

37 V

Sections

1

Tetrode

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

Base

4K

Socket

UX4

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

UX4

Heater

6.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

Not recorded

Heater

2 V

Sections

1

Tetrode

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.

Base

5E

Socket

UX5

Heater

2.5 V

Sections

1

Tetrode

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

Base

5E

Socket

UX5

Heater

6.3 V

Sections

1

Tetrode

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

Base

7EW

Socket

B7G

Heater

2.9 V

Sections

1

Tetrode

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.

Base

Not recorded

Socket

B7G

Heater

2.9 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B7G

Heater

2.9 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B8D

Heater

1.25 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

UX4

Heater

6.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

UX4

Heater

6.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

UX4

Heater

6.3 V

Sections

1

Tetrode

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.

Base

6A

Socket

UX6

Heater

30 V

Sections

1

Tetrode

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

Base

5C

Socket

UX5

Heater

2 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B5

Heater

5 V

Sections

1

Tetrode

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.

Base

Not recorded

Socket

B5

Heater

5 V

Sections

1

Tetrode

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

Base

7FT

Socket

B7G

Heater

4.5 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

Not recorded

Heater

1.25 V

Sections

1

Tetrode

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.

Base

5E

Socket

UX5

Heater

2.5 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

U7B

Heater

6.3 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B9A

Heater

1.25 V

Sections

1

Tetrode

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

Base

Not recorded

Socket

B9A

Heater

2.56 V

Sections

1

Tetrode

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

Base

7EW

Socket

B7G

Heater

6.3 V

Sections

1

Tetrode

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.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1