Voltage - Pentode vacuum tubes

Pentode

High-gain pentode designed specifically for microphone preamplifiers and other low-level resistance-coupled audio stages.

Base

Not recorded

Socket

P8A

Heater

30 V

Sections

1

Pentode

Raytheon subminiature pentode designed for compact small-signal voltage-amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1

Pentode

Raytheon subminiature pentode for voltage amplification in compact electronic equipment where space is severely limited.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1

Pentode

Raytheon subminiature pentode whose supported defining role is compact small-signal amplification; available source does not establish a narrower application.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1

Pentode

Directly heated Raytheon subminiature pentode for low-voltage battery-powered voltage amplification, typically operating near 45 V plate supply.

Base

6C

Socket

Not recorded

Heater

1.25 V

Sections

1

Pentode

Directly heated Raytheon subminiature power-amplifier pentode using a 1.25 V, 30 mA filament and typical 45 V plate supply. Designed for compact battery-operated output stages.

Base

5E

Socket

Not recorded

Heater

1.25 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

5J

Socket

B5D

Heater

0.625 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

5J

Socket

B5D

Heater

0.625 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

5F

Socket

B5D

Heater

0.625 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

5J

Socket

B5D

Heater

0.625 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

Not recorded

Heater

1.25 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Raytheon subminiature pentode; this datasheet explicitly identifies pentode construction rather than the current triode classification.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Reliable-cathode Raytheon subminiature pentode; the datasheet explicitly identifies pentode construction rather than the current triode classification.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Directly heated subminiature pentode designed specifically for low-power radiosonde electronic service.

Base

5A

Socket

Not recorded

Heater

1.25 V

Sections

1

Pentode

Secondary-emitter high-slope pentode designed for wide-band radio-frequency amplification.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Rugged low-noise audio-frequency pentode designed for low-level LF amplifiers, with low hum and microphony.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

British designation for the miniature 1S4-family directly heated battery output pentode.

Base

Not recorded

Socket

Not recorded

Heater

1.4 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

Not recorded

Heater

1.4 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

Not recorded

Heater

1.4 V

Sections

1

Pentode

Pentode designed for ultra-short-wave radio-frequency amplification in receiving equipment.

Base

Not recorded

Socket

Not recorded

Heater

1.4 V

Sections

1

Pentode

High-transconductance long-life pentode designed for wide-band amplification, explicitly co-designated with type 7721.

Base

9EQ

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Pentode designed for ultra-short-wave radio-frequency amplification in receiving equipment.

Base

Not recorded

Socket

ACORN5

Heater

1.25 V

Sections

1

Pentode

Pentode intended for voltage-amplifier or receiving service; available source does not clearly establish a narrower functional classification.

Base

Not recorded

Socket

POST8

Heater

1.4 V

Sections

1

Pentode

Directly heated output power pentode designed for low-frequency audio amplification. Widely documented for battery equipment, it combines modest filament demand with useful portable audio output.

Base

Miniature

Socket

B7G

Heater

1.4 V

Sections

1

Pentode

RFT pentode documented with nominal values, operating characteristics, and maximum ratings. The available source establishes pentode operation but does not clearly identify a specialized application or cutoff family.

Base

Not recorded

Socket

WIRE8

Heater

1.2 V

Sections

1

Pentode

Battery RF output pentode designed for Class-C amplifier and oscillator service. Its directly heated construction provides radio-frequency power generation from portable battery supplies.

Base

Not recorded

Socket

WIRE8

Heater

1.25 V

Sections

1

Pentode

Cossor pentode with manufacturer-published technical data, construction information, and operating recommendations. The available source establishes conventional pentode service but does not provide sufficiently explicit functional wording for a narrower classification.

Base

Not recorded

Socket

B7

Heater

16 V

Sections

1

Pentode

Premium-quality E180F/6688 broad-band amplifier pentode. Multiple professional manufacturer sources document high-performance wideband signal amplification with special-quality construction for reliable, stable service.

Base

Noval

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Special-quality high-slope pentode designed for wide-band amplifier service requiring stable characteristics and long life. Its professional construction combines substantial transconductance with extended dependable operation.

Base

Noval

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Special-quality high-slope pentode for wide-band amplifier service requiring stable characteristics and long life. Manufacturer documentation emphasizes professional broadband amplification with extended operating reliability.

Base

9EQ

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

High-transconductance broadband power pentode designed for low-distortion output stages in video and oscilloscope amplifiers. It combines substantial load-driving capability with wide frequency response.

Base

Noval

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

RFT pentode documented with nominal values, operating characteristics, and maximum ratings. The available manufacturer source does not provide sufficiently explicit application or cutoff terminology to support a narrower functional category.

Base

Not recorded

Socket

Not recorded

Heater

18 V

Sections

1

Pentode

RFT pentode documented with nominal values, operating characteristics, and maximum ratings. The available source establishes pentode operation but does not clearly identify a specialized functional or cutoff family.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

Special-quality audio-frequency amplifying pentode for industrial applications requiring stable characteristics and long life. Philips and Amperex documentation emphasize professional AF voltage amplification with extended dependable service.

Base

NOVAL

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Premium special-purpose pentode documented by Philips and Amperex with professional ratings and characteristics. The available material establishes premium-quality specialized service but does not provide enough explicit functional wording for a narrower TubeType.

Base

NOVAL

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Very-high-transconductance special-quality pentode documented by Philips for demanding professional amplification. Its defining characteristics are unusually high transconductance and premium construction rather than a separately documented specialized application.

Base

NOVAL

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Premium wide-band amplifier pentode documented by Amperex, Philips, Mullard, and other manufacturers. It is intended for professional broadband signal amplification where stable characteristics and special-quality construction are important.

Base

9C12

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Pentode documented for amplifier service. The available Lorenz source establishes a signal-amplifier function but does not provide sufficiently explicit application or cutoff terminology to support a narrower functional classification.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Pentode designed for RF, IF, and AF amplification, with documented triode-connected operation as well. Its broad signal-amplifier capability spans several receiver and audio-frequency stages rather than a single specialized function.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

High-slope low-noise pentode designed for sensitive signal amplification. Its combination of substantial transconductance and reduced noise makes it useful in low-level amplifier stages where noise performance is important.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Frame-grid high-transconductance pentode designed for wideband and television IF amplification. Its specialized grid construction provides high gain and bandwidth for demanding television and broadband signal stages.

Base

B9A

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

High-impedance audio pentode for general voltage amplification and phase-inverter service, providing substantial gain for vintage audio amplifier circuitry.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

High-gain low-microphony pentode for RF, IF, and sensitive audio preamplifier stages, with very high plate resistance.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

High-gain audio pentode with anti-microphonic construction and low-hum heater for microphone and other sensitive preamplifier stages.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1