Voltage Pentode or Tetrode (with diode) vacuum tubes

Diode-Diode-Pentode

Frame-grid sharp-cutoff pentode combined with two diode sections for television video amplification and horizontal phase-detector service.

Base

Not recorded

Socket

B9A

Heater

10.2 V

Sections

3

Diode-Diode-Pentode

Twin discriminator diodes and sharp-cutoff pentode designed for television horizontal AFC discrimination and low-frequency horizontal-oscillator service.

Base

9RL

Socket

B9A

Heater

11.4 V

Sections

3

Pentode-Rectifier

Combination half-wave rectifier and power-amplifier pentode designed for compact AC/DC receivers, integrating power-supply rectification with audio output amplification.

Base

7-K

Socket

UX7

Heater

12.6 V

Sections

2

Diode-Diode-Pentode

Double-diode remote-cutoff pentode designed for RF, IF, or AF amplification together with receiver detection functions.

Base

Not recorded

Socket

B9A

Heater

17 V

Sections

3

Diode-Pentode

Source mismatch prevents a defensible functional classification: the supplied manufacturer page does not contain a printed 1AF5 entry, so neighboring tube data were not inferred.

Base

6AU

Socket

B7G

Heater

1.4 V

Sections

2

Diode-Pentode

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Base

6AU

Socket

Not recorded

Heater

1.4 V

Sections

2

Diode-Pentode

Russian diode-pentode designed for low-frequency voltage preamplification and signal detection in receiving equipment.

Base

Not recorded

Socket

Not recorded

Heater

1.2 V

Sections

2

Diode-Pentode

Battery diode-pentode combining signal detection with subsequent voltage amplification. The diode supplies detector action while the pentode operates from low-voltage receiver supplies with an economical directly heated filament.

Base

Not recorded

Socket

B7G

Heater

1.4 V

Sections

2

Diode-Diode-Pentode

Duo-diode pentode combining two detector diodes with a pentode amplifier section; available documentation does not support a narrower functional assignment.

Base

Not recorded

Socket

Not recorded

Heater

2 V

Sections

3

Diode-Diode-Pentode

Directly heated Radiotron dual-diode pentode, combining two signal detector diode plates with a pentode amplifier. Uses a 2 V, 120 mA coated filament and an eight-contact octal base.

Base

Not recorded

Socket

Not recorded

Heater

2 V

Sections

3

Diode-Pentode

Battery-receiver combination tube containing a detector diode and power-amplifier pentode for signal detection and audio output service.

Base

7AM

Socket

IO

Heater

1.4 V

Sections

2

Diode-Pentode

GT-envelope battery-receiver tube combining a detector diode with a power-amplifier pentode for detection and audio output service.

Base

7AM

Socket

Not recorded

Heater

1.4 V

Sections

2

Diode-Pentode

Diode and sharp-cutoff pentode for detection and IF amplification.

Base

Not recorded

Socket

Not recorded

Heater

20 V

Sections

2

Diode-Diode-Pentode

Reliable duplex-diode pentode related to the 12C8 family, designed for operation under severe vibration and intermittent service.

Base

Not recorded

Socket

Not recorded

Heater

12.6 V

Sections

3

Diode-Pentode

High-perveance diode and sharp-cutoff pentode combination for television IF amplification, video detection, AGC, and DC-restorer service.

Base

9CY

Socket

B9A

Heater

4.7 V

Sections

2

Diode-Pentode

General-purpose combination of a high-perveance diode and sharp-cutoff pentode for receiver detector and amplifier applications.

Base

9DB

Socket

B9A

Heater

4.7 V

Sections

2

Diode-Diode-Pentode

Indirectly heated double-diode, sharp-cutoff pentode designed for television AFC and detector circuits, IF and video amplification, and automatic gain control. Features a 4.7 V, 600 mA controlled-warm-up heater suitable for series-string operation.

Base

Not recorded

Socket

B9A

Heater

4.7 V

Sections

3

Diode-Diode-Pentode

Double-diode pentode designed for television detector and amplifier service.

Base

9HK

Socket

B9A

Heater

4.7 V

Sections

3

Diode-Pentode

Mullard diode-pentode with published amplifier characteristics; available documentation does not establish a sufficiently specific functional role for narrower classification.

Base

8FW

Socket

Not recorded

Heater

6.3 V

Sections

2

Diode-Diode-Pentode

Compactron pentode and double-diode combination designed for color-television IF amplification and phase-detector service.

Base

Not recorded

Socket

BUTTON12

Heater

6.3 V

Sections

3

Diode-Pentode

Miniature diode-pentode designed for combined television video-detector and final-IF amplifier service.

Base

9CY

Socket

B9A

Heater

6.3 V

Sections

2

Diode-Pentode

High-perveance diode and sharp-cutoff pentode for television IF amplification, video detection, AGC, and DC-restorer service.

Base

9CY

Socket

B9A

Heater

6.3 V

Sections

2

Diode-Pentode

High-perveance diode and sharp-cutoff pentode for television or radio IF, video, AGC, detector, and DC-restorer applications.

Base

9AK

Socket

B9A

Heater

6.3 V

Sections

2

Diode-Diode-Pentode

Receiving tube combining radio signal detection or control-voltage rectification with associated voltage amplification. Its detector function is integral to receiver signal processing and supports classification within the radio detector/converter family.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Receiving tube combining radio signal detection or control-voltage rectification with associated voltage amplification. Its detector function is integral to receiver signal processing and supports classification within the radio detector/converter family.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Receiving tube combining radio signal detection or control-voltage rectification with associated voltage amplification. Its detector function is integral to receiver signal processing and supports classification within the radio detector/converter family.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Australian Radiotron dual-diode audio-output power pentode.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Double-diode pentode designed for IF amplification, detection, and automatic gain control in automobile radio receivers.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Double-diode pentode combining detector and control-voltage rectification with signal amplification. Paired diodes permit complementary detection or control functions while the pentode supplies the active gain stage.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

3

Diode-Pentode

High-frequency pentode with auxiliary diode for controlled amplification, mixing, variable-reactance, modulator, and timing applications at HF through UHF.

Base

B7G

Socket

B7G

Heater

6.3 V

Sections

2

Diode-Tetrode

Diode and twin-plate tetrode designed specifically for frequency-divider and complex-wave-generator circuits, combining switching or waveform generation with an integrated rectifying/control diode.

Base

Not recorded

Socket

B9A

Heater

6.3 V

Sections

2

Diode-Pentode

Television diode-pentode combining a video-detector diode with a high-transconductance sharp-cutoff pentode for IF amplification, integrating picture-signal detection and wideband IF gain.

Base

9CY

Socket

B9A

Heater

6.3 V

Sections

2

Diode-Tetrode

Diode and three-plate tetrode for frequency-divider and complex-wave-generator circuits in electronic musical instruments, intended for pulse and timing service rather than ordinary amplification.

Base

9QG

Socket

B9A

Heater

6.3 V

Sections

2

Diode-Diode-Pentode

Diode-pentode intended for television IF and video-detector service, combining a high-frequency pentode amplifier with a diode for picture-signal rectification.

Base

B9A

Socket

Not recorded

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Television diode-pentode combining IF amplification with video detection, allowing the pentode to provide wideband gain while the diode recovers the detected picture signal.

Base

9RL

Socket

B9A

Heater

6.3 V

Sections

3

Diode-Diode-Pentode

Series-heater diode-pentode for television IF amplification and video detection, integrating a high-transconductance pentode with a separate detector diode.

Base

Not recorded

Socket

B9A

Heater

8 V

Sections

3

Diode-Diode-Pentode

Series-string television diode-pentode intended for IF and video-detector service, combining wideband pentode amplification with a dedicated signal-detection diode.

Base

9RL

Socket

B9A

Heater

8.1 V

Sections

3

Diode-Tetrode

Philips binode combining a signal diode with an amplifying tetrode for receiver detection and signal amplification, integrating two radio signal-processing functions in one envelope.

Base

Not recorded

Socket

Not recorded

Heater

20 V

Sections

2