Voltage - Pentode vacuum tubes

Pentode

Subminiature dual-control RF pentode whose transconductance can be varied through the third grid. Manufacturer Class A data document operation at different grid-3 biases, making it useful where electronic gain or signal control is required.

Base

5702

Socket

SUBMINIATURE8

Heater

6.3 V

Sections

1

Pentode

High-gain miniature broad-band pentode intended for wideband amplification. Amperex and other manufacturer sources document broad-band operating conditions, high gain, and shielding considerations for signal circuits requiring substantial bandwidth.

Base

E9-1

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Filamentary electrometer pentode designed for extremely low-current circuitry. It may also be connected as a triode for specialized electrometer applications, making ultra-high-impedance measurement rather than ordinary RF or audio amplification its defining function.

Base

Not recorded

Socket

Not recorded

Heater

1.25 V

Sections

1

Pentode

Standard Telephones pentode with manufacturer-specified technical characteristics, ratings, and operating information. The available source establishes signal pentode service but does not provide sufficiently explicit application wording to justify a narrower functional classification.

Base

Not recorded

Socket

B5

Heater

4 V

Sections

1

Pentode

Carrier-frequency pentode from the 5A136A/5A136D and 4328A/4328D family. Designed for telecommunications carrier systems, it is a professional signal-amplifier tube rather than a consumer receiving or power-output pentode.

Base

Not recorded

Socket

UX6

Heater

7.5 V

Sections

1

Pentode

Companion designation in the 5A136A/5A136D carrier-pentode family. Manufacturer documentation identifies the family for telecommunications carrier-frequency service, where the pentode functions as a professional signal amplifier.

Base

Not recorded

Socket

UX6

Heater

7.5 V

Sections

1

Pentode

Carrier-frequency pentode, also published as type 4310A. Standard Telephones documentation identifies it for telecommunications carrier service, giving it a specialized professional signal-amplification role rather than general receiver use.

Base

Not recorded

Socket

UX6

Heater

10 V

Sections

1

Pentode

Standard Telephones pentode with published technical characteristics, ratings, and operating information. The available source establishes pentode signal service but does not explicitly identify a sufficiently narrow application category for further functional reassignment.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Carrier-frequency pentode identified as the replacement-purpose A version of its family. Designed for professional telecommunications carrier equipment, it serves signal-amplification duties rather than consumer receiving or power-output applications.

Base

Not recorded

Socket

UX6

Heater

7.5 V

Sections

1

Pentode

Carrier-frequency pentode designed for professional telecommunications equipment. Standard Valves documentation identifies its specialized carrier-system signal-amplification function, distinguishing it from general-purpose receiving pentodes.

Base

Not recorded

Socket

UX6

Heater

7.5 V

Sections

1

Pentode

Carrier-frequency pentode intended for professional telecommunications carrier equipment. Its defining role is signal amplification within carrier systems rather than ordinary broadcast reception or power-output service.

Base

Not recorded

Socket

UX6

Heater

10 V

Sections

1

Pentode

Coaxial-repeater pentode designed for telecommunications repeater service. Its manufacturer-defined role is amplification in coaxial transmission systems, making long-distance communications infrastructure its primary functional identity.

Base

Not recorded

Socket

UX6

Heater

6.3 V

Sections

1

Pentode

Pentode with an 18 V, 0.1 A heater and published Class A characteristics. The available manufacturer and handbook sources establish signal-amplifier operation but do not clearly support a narrower functional classification.

Base

9BK

Socket

B9A

Heater

18 V

Sections

1

Pentode

Pentode documented with Class A characteristics and a maximum anode dissipation of about 12 W. Manufacturer registration data establish substantial signal/power capability, but the available functional wording is insufficient to classify it specifically as an output pentode.

Base

9BA

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

High-gain low-noise pentode designed for audio preamplifier and input stages. Amperex documentation emphasizes minimizing hum, noise, and microphony, making sensitive low-level audio voltage amplification its defining application.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Mullard pentode with published Class A ratings and characteristics. The available manufacturer source establishes conventional signal-amplifier operation but does not provide sufficiently explicit application or cutoff terminology for a narrower functional classification.

Base

8CP

Socket

IO

Heater

1.25 V

Sections

1

Pentode

Subminiature low-microphony voltage-amplifier pentode. Designed for sensitive signal stages where vibration-induced noise must be minimized, it combines compact construction with reduced microphonic response for dependable voltage amplification.

Base

6391

Socket

SUBMINIATURE8

Heater

6.3 V

Sections

1

Pentode

Premium-quality E180F/6688 high-transconductance pentode developed for demanding broadband amplification in professional communications and instrumentation.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

A-suffix variant of the high-transconductance 6688 broadband pentode, retaining professional wideband amplifier characteristics.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Long-life wideband pentode developed for professional telephone and communications amplifier service with dependable continuous-duty operation.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

High-temperature receiving pentode designed for low-current small-signal amplification where conventional receiving tubes cannot tolerate the operating environment.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Dual-control pentode designed specifically for switching and early computer circuitry, supporting logic, gating, and pulse-control functions.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

Extended-life high-transconductance RF pentode developed for broadband amplifier input stages and continuous professional service.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

Rugged high-slope pentode for RF/AF amplification, blocking oscillators, flip-flops, and divide-by-two pulse logic circuits.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Low-noise miniature audio pentode designed specifically for the early stages of high-gain audio amplifiers.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Low-microphony pentode for sensitive early stages of high-gain audio amplifiers, including microphone and preamplifier circuits.

Base

9BC

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Very-low-microphony pentode designed for extremely sensitive low-level audio preamplification, with practical input levels down to approximately 10 µV.

Base

9BB

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

High-transconductance VHF pentode developed specifically for television IF and video-amplifier stages requiring wideband gain.

Base

9AQ

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

General-purpose high-slope pentode for RF, IF, video-amplifier, and mixer service in television receivers.

Base

9AQ

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Early sharp-cutoff pentode designed for radio detector and fixed-gain RF amplifier service.

Base

6F

Socket

UX6

Heater

6.3 V

Sections

1

Pentode

High-transconductance sharp-cutoff pentode developed for television RF and IF amplification in VHF tuner and intermediate-frequency stages.

Base

7CM

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

High-slope screened HF pentode designed for television IF amplification, video output, and synchronizing-pulse amplifier service.

Base

B9A

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Russian pentode documented in technical reference literature; available source does not clearly establish a narrower application beyond pentode amplification.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Russian cathode-grid pentode designed for wideband RF preamplification and electronic switching circuits.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Russian cathode-grid pentode designed for wideband RF preamplification and electronic switching circuits.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Specialized Russian miniature pentode for voltage amplification in radio-electronic equipment. Manufacturer documentation identifies a general signal-amplifier role but does not provide sufficiently specific functional wording to justify a narrower category.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Long-life Russian miniature pentode for voltage amplification in radio-electronic equipment. Its defining distinction is extended service life while retaining a general small-signal voltage-amplifier function.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1

Pentode

Russian miniature pentode intended for voltage amplification in radio-electronic equipment. Manufacturer documentation identifies it as a compact general signal-amplifier tube rather than a power-output or specialized conversion device.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

High-reliability Russian subminiature pentode designed for voltage amplification. Its compact construction and reliability-oriented design suit small-signal electronic equipment requiring dependable operation in limited space.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

High-reliability Russian subminiature pentode for voltage amplification. Manufacturer documentation emphasizes compact construction and dependable small-signal service rather than power output or another specialized functional role.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Russian miniature pentode designed for voltage amplification in radio-electronic equipment. Its manufacturer description supports a conventional small-signal amplifier function without sufficiently explicit evidence for a narrower functional category.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Ruggedized Russian metal pentode designed for high- and intermediate-frequency amplification. Its strengthened construction supports RF/IF signal service in equipment exposed to more demanding mechanical conditions.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

Russian subminiature pentode with an exponential transfer characteristic, designed for functional conversion rather than ordinary linear amplification. Its nonlinear characteristic enables electronic mathematical or signal-function transformation in specialized circuitry.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Russian subminiature pentode with a square-law transfer characteristic, designed for functional conversion. Its deliberately nonlinear response enables mathematical or signal-function transformation rather than conventional linear RF or audio amplification.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Russian pentode documented in bilingual manufacturer literature. The available source establishes pentode operation but does not provide sufficiently explicit functional or cutoff terminology to support a narrower classification conservatively.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Extended-life Russian pentode for demanding pulse and electronic-control applications, emphasizing high pulse current and professional service life.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Russian high-current pentode developed for pulse and specialized control circuitry, with substantial short-duration plate and screen current capability.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

High-current Russian pentode for demanding pulse operation, combining roughly 35 W plate dissipation with more than 600 mA pulse plate current.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1