Voltage - Pentode Sharp Cutoff (single) vacuum tubes

Pentode

Sharp-cutoff pentode designed for RF, IF, wide-band, or high-frequency voltage-amplifier service.

Base

7BK

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Industrial long-life sharp-cutoff pentode designed for wide-band IF and RF amplifiers. Westinghouse documentation provides both pentode and triode-connected data, combining broadband signal performance with extended industrial service life.

Base

Not recorded

Socket

B7G

Heater

12.6 V

Sections

1

Pentode

Miniature sharp-cutoff pentode designed for industrial applications. Its compact fixed-gain construction supports professional signal-amplifier service where small size and dependable operation are important.

Base

7BK

Socket

B7G

Heater

12.6 V

Sections

1

Pentode

Toshiba rugged sharp-cutoff micro-metal RF pentode. Its compact metal construction combines fixed-gain high-frequency amplification with enhanced mechanical durability for demanding electronic equipment.

Base

Not recorded

Socket

SUBMINIATURE8

Heater

6.3 V

Sections

1

Pentode

Seven-pin miniature sharp-cutoff UHF pentode electrically similar to type 954. Designed for fixed-gain ultra-high-frequency amplification, it combines compact construction with operation well into the UHF region.

Base

7BD

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Acorn sharp-cutoff pentode designed for high-frequency amplifier service to approximately 430 MHz. Its compact acorn construction minimizes lead lengths for fixed-gain VHF/UHF signal amplification.

Base

5BB

Socket

ACORN7

Heater

6.3 V

Sections

1

Pentode

Directly heated acorn sharp-cutoff pentode designed for dry-cell battery RF amplifier service. It combines compact high-frequency construction with low-power filament operation for portable receiving equipment.

Base

5BE

Socket

ACORN7

Heater

1.25 V

Sections

1

Pentode

High-slope Mazda screened high-frequency pentode for fixed-gain RF amplification in AC mains receivers.

Base

Not recorded

Socket

M7A

Heater

4 V

Sections

1

Pentode

Acorn pentode for RF amplifier and detector service. Compact low-capacitance construction minimizes lead lengths for improved high-frequency performance while providing useful small-signal gain.

Base

Not recorded

Socket

ACORN7

Heater

4 V

Sections

1

Pentode

Philips high-frequency pentode for RF voltage amplification, combining substantial transconductance with exceptionally high plate resistance.

Base

Not recorded

Socket

B5

Heater

20 V

Sections

1

Pentode

European receiving pentode for small-signal voltage amplification, combining useful transconductance with high plate resistance.

Base

Not recorded

Socket

P8A

Heater

4 V

Sections

1

Pentode

Receiving pentode with an unusual 18 V heater for small-signal amplification in higher-voltage, lower-current heater systems.

Base

Not recorded

Socket

P8A

Heater

18 V

Sections

1

Pentode

Pentode designed for radio-frequency or wide-band amplifier service in receiving or electronic equipment.

Base

9X

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Pentode designed for radio-frequency or wide-band amplifier service in receiving or electronic equipment.

Base

5E

Socket

Not recorded

Heater

0.625 V

Sections

1

Pentode

Pentode designed for radio-frequency or wide-band amplifier service in receiving or electronic equipment.

Base

7BD

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Fast-warm-up sharp-cutoff subminiature pentode designed for VHF service with long life, stable performance, and high reliability under temperature and vibration. Its construction targets demanding professional high-frequency equipment.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Pentode designed for radio-frequency or wide-band amplifier service in receiving or electronic equipment.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Service designation explicitly associated with the 1L4 miniature battery RF pentode. It provides compact fixed-gain high-frequency amplification using a low-power filament suitable for portable equipment.

Base

Not recorded

Socket

B7G

Heater

1.4 V

Sections

1

Pentode

Low-filament-current battery pentode designed for RF, IF, and audio-frequency amplification in portable receiving equipment.

Base

Not recorded

Socket

IO

Heater

1.4 V

Sections

1

Pentode

Subminiature high-frequency pentode electrically similar to type 1AD4. Its compact construction supports fixed-gain RF signal amplification in miniature electronic equipment.

Base

Not recorded

Socket

WIRE8

Heater

1.25 V

Sections

1

Pentode

Mullard miniature short-grid-base RF pentode for battery-operated equipment. Manufacturer documentation identifies RF/IF amplifier service, combining compact construction, low-power filament operation, and fixed-gain high-frequency performance.

Base

Not recorded

Socket

B7G

Heater

1.4 V

Sections

1

Pentode

Shock- and vibration-resistant sharp-cutoff high-frequency pentode documented by Amperex and Philips. It combines fixed-gain HF amplification with rugged special-quality construction for demanding professional service.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Mullard short-wave sharp-cutoff RF pentode with high mutual conductance. Its substantial transconductance and fixed-control characteristic provide strong gain in short-wave high-frequency signal stages.

Base

Not recorded

Socket

B9G

Heater

6.3 V

Sections

1

Pentode

Sharp-cutoff video-frequency pentode with very high mutual conductance. Mullard documentation identifies it for wideband video amplification where substantial fixed gain and high-frequency response are required.

Base

B9G

Socket

B9G

Heater

6.3 V

Sections

1

Pentode

Philips high-frequency sharp-cutoff pentode for fixed-gain RF voltage amplification in European receiver equipment.

Base

P-SIDECONTACT

Socket

P8A

Heater

6.3 V

Sections

1

Pentode

Subminiature high-slope RF pentode designed for high-frequency amplifier stages. Its compact construction and substantial transconductance support fixed-gain RF signal amplification.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Double-anode fixed-slope pentode designed specifically for extraction and separation of television synchronizing signals. Its specialized electrode structure performs sync-separator functions rather than ordinary RF or IF voltage amplification.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Miniature sharp-cutoff RF pentode with high mutual conductance. Mullard and Philips documentation identify it for fixed-gain high-frequency amplification requiring substantial transconductance from a compact tube.

Base

B7G

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Indirectly heated fixed-slope pentode designed for RF voltage amplification. Its abrupt transfer characteristic provides fixed high-frequency gain rather than the variable-mu behavior used for automatic gain control.

Base

Not recorded

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Sharp-cutoff pentode designed for RF or IF amplification in high-frequency wide-band applications to approximately 400 MHz. Its compact construction provides fixed-gain broadband signal performance.

Base

7BD

Socket

B7G

Heater

6.3 V

Sections

1

Pentode

Low-heater-power Russian pentode for specialized small-signal electronic service; available source does not establish a narrower application reliably.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

1

Pentode

Sharp-cutoff high-transconductance pentode designed as an IF amplifier in color and black-and-white television receivers. Its substantial transconductance supports wideband fixed-gain television intermediate-frequency amplification.

Base

Not recorded

Socket

B9A

Heater

4.4 V

Sections

1

Pentode

Telefunken high-impedance RF pentode for fixed-gain high-frequency amplification in professional radio equipment.

Base

Not recorded

Socket

P8A

Heater

12.6 V

Sections

1

Pentode

Fixed-slope pentode designed for transitron circuits and low-level voltage amplification. Manufacturer data also identify low-noise amplifier service, making it suitable for sensitive signal and specialized oscillator/reactance circuits.

Base

Not recorded

Socket

B9A

Heater

4.5 V

Sections

1

Pentode

Cossor pentode for conventional amplifier service in mains-powered equipment without a more specific documented application.

Base

Not recorded

Socket

B5

Heater

4 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF amplification, including short-wave or VHF service according to type.

Base

Not recorded

Socket

Not recorded

Heater

12.6 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF and intermediate-frequency amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF and intermediate-frequency amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

Telefunken high-frequency pentode for RF and IF amplification and detector service. Its ability to function as either signal amplifier or detector gives it broader receiver usefulness than a specialized RF-only pentode.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF and intermediate-frequency amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF and intermediate-frequency amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF and intermediate-frequency amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF and intermediate-frequency amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

Special-quality screened high-frequency pentode with a short-cutoff suppressor-grid characteristic for modulation, gating, and variable-reactance applications. Rugged construction supports these specialized control functions under shock and vibration.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF amplification, including short-wave or VHF service according to type.

Base

Not recorded

Socket

Not recorded

Heater

1.9 V

Sections

1

Pentode

High-frequency receiving pentode designed for RF amplification, including short-wave or VHF service according to type.

Base

Not recorded

Socket

IO

Heater

18 V

Sections

1

Pentode

Directly heated battery high-frequency pentode for RF amplification, detector service, and regenerative receiver stages. High plate resistance provides useful gain with economical filament consumption.

Base

Not recorded

Socket

B5

Heater

2 V

Sections

1

Pentode

Sharp-cutoff high-transconductance pentode designed as an IF amplifier in color and black-and-white television receivers. Its fixed-gain wideband characteristics suit demanding television intermediate-frequency stages.

Base

E9-1

Socket

B9A

Heater

3.15 V

Sections

1