Directly heated receiving power triode for audio-frequency output service, with Class A operation to about 1.6 W single-ended and published push-pull Class B operation reaching roughly 25 W from a pair.
High-mu transmitting power triode for Class C RF amplification or oscillation and Class B audio/modulator service. Rated for 100 W plate dissipation, operation to about 40 MHz, and several hundred watts output under published conditions.
Low-mu Eimac transmitting power triode intended for RF amplifier, oscillator, and modulator service. Its published operating data cover substantial Class C RF output and audio/modulator operation at plate voltages up to several kilovolts.
Dissimilar dual triode combining a high-mu voltage-amplifier section with a low-mu 10 W power section, derived from the GF7 family for demanding driver and output applications.
Radiation-cooled Amperex transmitting triode for RF power amplification and oscillation, with Class B audio-amplifier or modulator service also specified. Rated for 75 W plate dissipation and operation to approximately 30 MHz.
Dual low-mu power triode designed for booster-scanning circuits and series-regulator service in DC power supplies. Its sections withstand severe pulse conditions, including kilovolt-level inverse and control-grid pulse voltages.
Dissimilar dual triode, electrically equivalent to 6FY7/15FY7 apart from heater characteristics, combining a high-mu section with a low-mu, pulse-capable power output section.
Modern directly heated audio power triode intended for single-ended amplifier service. Published operation at 500 V and 50 mA produces about 4.1 W into a 5 kΩ load, with 25 W maximum plate dissipation.
Directly heated graphite-anode radiation-cooled triode for RF heating, modulation, and transmitting service, using a thoriated-tungsten filament for substantial industrial RF power.
4 pins - SPECIAL4 - Special 4-contact transmitting-tube base
Forced-air-cooled medium-mu high-vacuum transmitting triode for high-power RF amplification, oscillator, and modulator service in professional transmitting equipment.
Directly heated graphite-anode radiation-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial high-frequency power.
Directly heated forced-air-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial continuous high-frequency power.
Directly heated water-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial continuous high-frequency power.
Directly heated vapor-cooled triode designed specifically for industrial RF-heating equipment, with full-rating operation documented to approximately 60 MHz.
Directly heated amplifier triode developed for critical audio-frequency applications where low microphonics are important. Rated for 15 W plate dissipation, it combines power-triode capability with construction intended to reduce mechanically induced signal disturbance.
High-power directly heated audio triode related to the PX25 family. Published Class A operation at 580 V and 110 mA produces about 22 W into a 2.7 kΩ load, with 64 W maximum plate dissipation.
Cathode-tapped V4 version of the directly heated 1605 high-power audio triode. Published Class A conditions specify about 22 W output at 580 V and 110 mA, with a 64 W maximum plate-dissipation rating.
RCA transmitting power triode for RF power and oscillator service, with Class B audio/modulator operation also specified. Rated for 20 W plate dissipation and full-rating high-frequency operation to approximately 45 MHz.
Transmitting power triode intended for AF and RF power amplification, Class B modulation, and oscillator service. Published Class B intermittent-service conditions reach roughly 145 W maximum-signal output.
High-mu twin triode intended for audio amplification and Class-B power-amplifier service, combining two triode units in one envelope for push-pull output operation.
Directly heated forced-air-cooled transmitting triode with thoriated-tungsten filament, designed for substantial RF transmitter service and direct filament switching.
Directly heated water-cooled triode with integral cooling for industrial induction-heating equipment, using a thoriated-tungsten filament suitable for direct switching.
Directly heated power triode documented in AEI industrial-valve literature; available source evidence supports industrial high-power service but not a narrower application statement without speculation.
Directly heated low-load-resistance power-amplifier triode retained as a replacement type for older Sparton receivers, intended for receiver audio-output service.
Directly heated low-load-resistance power-amplifier triode retained as a replacement type for older Sparton receivers. Published Class A operation uses about 250 V plate supply and provides approximately 1.8 W output.
Twin triode designed as a Class-B push-pull power amplifier for battery receivers, with the two triode units operated together to deliver approximately two watts of audio output.
Directly heated twin triode designed as a Class-B push-pull power amplifier for battery-operated receivers, using two triode units together for economical audio-output service.
Directly heated twin-triode power amplifier for battery receivers, designed for Class-B push-pull audio output from a low-voltage 1.4 V filament supply.
Directly heated twin triode intended for Class-B push-pull audio power amplification in battery receivers, with both triode units cooperating as the output stage.
Directly heated twin-triode power amplifier intended for Class-B push-pull battery-receiver service, using a 2.0 V filament and delivering about two watts of audio output.
Thoriated-tungsten transmitting power triode for Class C oscillator and RF power-amplifier service, with additional transmitting applications. Rated for about 100 W plate dissipation and kilovolt-level plate operation.
Taylor transmitting power triode closely related to the 203-Z, but with amplification factor about 25 and the plate lead brought through the base. Published ratings cover Class C oscillator and RF power-amplifier service.
Directly heated power triode for RF and audio amplification, oscillator, and modulator service. Amperex rates it for substantial transmitting duty, with 100 W plate dissipation and plate voltage up to 1.5 kV.
High-mu zero-bias Taylor power triode designed especially for Class B audio service. Its high amplification factor permits little or no grid bias, and a pair is specified for roughly 300 W output.
Directly heated power triode intended for audio-frequency amplifier service. Manufacturer data emphasize power-output operation and the electrical characteristics of a low-mu filamentary triode rather than small-signal receiving use.
Filamentary power triode developed for power-amplifier applications, with operating information emphasizing output service and substantial plate loading. Its documented role is best understood as a general power triode.
Power-output triode intended for amplifier service, using a directly heated filament and operating conditions suited to appreciable audio-frequency output. The documentation places it in power rather than small-signal triode service.
Filamentary transmitting triode for radio-frequency amplifier and oscillator service. Manufacturer ratings and operating conditions identify it as an RF power device rather than a receiving or small-signal triode.
Transmitting power triode intended for RF amplifier and oscillator operation. Its published service data center on radio-frequency power generation and the plate loading expected of an industrial transmitting tube.
Directly heated receiving power triode for audio-frequency output service, with Class A operation to about 1.6 W single-ended and published push-pull Class B operation reaching roughly 25 W from a pair.
High-mu transmitting power triode for Class C RF amplification or oscillation and Class B audio/modulator service. Rated for 100 W plate dissipation, operation to about 40 MHz, and several hundred watts output under published conditions.
Low-mu Eimac transmitting power triode intended for RF amplifier, oscillator, and modulator service. Its published operating data cover substantial Class C RF output and audio/modulator operation at plate voltages up to several kilovolts.
Dissimilar dual triode combining a high-mu voltage-amplifier section with a low-mu 10 W power section, derived from the GF7 family for demanding driver and output applications.
Radiation-cooled Amperex transmitting triode for RF power amplification and oscillation, with Class B audio-amplifier or modulator service also specified. Rated for 75 W plate dissipation and operation to approximately 30 MHz.
Dual low-mu power triode designed for booster-scanning circuits and series-regulator service in DC power supplies. Its sections withstand severe pulse conditions, including kilovolt-level inverse and control-grid pulse voltages.
Dissimilar dual triode, electrically equivalent to 6FY7/15FY7 apart from heater characteristics, combining a high-mu section with a low-mu, pulse-capable power output section.
Modern directly heated audio power triode intended for single-ended amplifier service. Published operation at 500 V and 50 mA produces about 4.1 W into a 5 kΩ load, with 25 W maximum plate dissipation.
Directly heated graphite-anode radiation-cooled triode for RF heating, modulation, and transmitting service, using a thoriated-tungsten filament for substantial industrial RF power.
4 pins - SPECIAL4 - Special 4-contact transmitting-tube base
Forced-air-cooled medium-mu high-vacuum transmitting triode for high-power RF amplification, oscillator, and modulator service in professional transmitting equipment.
Directly heated graphite-anode radiation-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial high-frequency power.
Directly heated forced-air-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial continuous high-frequency power.
Directly heated water-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial continuous high-frequency power.
Directly heated vapor-cooled triode designed specifically for industrial RF-heating equipment, with full-rating operation documented to approximately 60 MHz.
Directly heated amplifier triode developed for critical audio-frequency applications where low microphonics are important. Rated for 15 W plate dissipation, it combines power-triode capability with construction intended to reduce mechanically induced signal disturbance.
High-power directly heated audio triode related to the PX25 family. Published Class A operation at 580 V and 110 mA produces about 22 W into a 2.7 kΩ load, with 64 W maximum plate dissipation.
Cathode-tapped V4 version of the directly heated 1605 high-power audio triode. Published Class A conditions specify about 22 W output at 580 V and 110 mA, with a 64 W maximum plate-dissipation rating.
RCA transmitting power triode for RF power and oscillator service, with Class B audio/modulator operation also specified. Rated for 20 W plate dissipation and full-rating high-frequency operation to approximately 45 MHz.
Transmitting power triode intended for AF and RF power amplification, Class B modulation, and oscillator service. Published Class B intermittent-service conditions reach roughly 145 W maximum-signal output.
High-mu twin triode intended for audio amplification and Class-B power-amplifier service, combining two triode units in one envelope for push-pull output operation.
Directly heated forced-air-cooled transmitting triode with thoriated-tungsten filament, designed for substantial RF transmitter service and direct filament switching.
Directly heated water-cooled triode with integral cooling for industrial induction-heating equipment, using a thoriated-tungsten filament suitable for direct switching.
Directly heated power triode documented in AEI industrial-valve literature; available source evidence supports industrial high-power service but not a narrower application statement without speculation.
Directly heated low-load-resistance power-amplifier triode retained as a replacement type for older Sparton receivers, intended for receiver audio-output service.
Directly heated low-load-resistance power-amplifier triode retained as a replacement type for older Sparton receivers. Published Class A operation uses about 250 V plate supply and provides approximately 1.8 W output.
Twin triode designed as a Class-B push-pull power amplifier for battery receivers, with the two triode units operated together to deliver approximately two watts of audio output.
Directly heated twin triode designed as a Class-B push-pull power amplifier for battery-operated receivers, using two triode units together for economical audio-output service.
Directly heated twin-triode power amplifier for battery receivers, designed for Class-B push-pull audio output from a low-voltage 1.4 V filament supply.
Directly heated twin triode intended for Class-B push-pull audio power amplification in battery receivers, with both triode units cooperating as the output stage.
Directly heated twin-triode power amplifier intended for Class-B push-pull battery-receiver service, using a 2.0 V filament and delivering about two watts of audio output.
Thoriated-tungsten transmitting power triode for Class C oscillator and RF power-amplifier service, with additional transmitting applications. Rated for about 100 W plate dissipation and kilovolt-level plate operation.
Taylor transmitting power triode closely related to the 203-Z, but with amplification factor about 25 and the plate lead brought through the base. Published ratings cover Class C oscillator and RF power-amplifier service.
Directly heated power triode for RF and audio amplification, oscillator, and modulator service. Amperex rates it for substantial transmitting duty, with 100 W plate dissipation and plate voltage up to 1.5 kV.
High-mu zero-bias Taylor power triode designed especially for Class B audio service. Its high amplification factor permits little or no grid bias, and a pair is specified for roughly 300 W output.
Directly heated power triode intended for audio-frequency amplifier service. Manufacturer data emphasize power-output operation and the electrical characteristics of a low-mu filamentary triode rather than small-signal receiving use.
Filamentary power triode developed for power-amplifier applications, with operating information emphasizing output service and substantial plate loading. Its documented role is best understood as a general power triode.
Power-output triode intended for amplifier service, using a directly heated filament and operating conditions suited to appreciable audio-frequency output. The documentation places it in power rather than small-signal triode service.
Filamentary transmitting triode for radio-frequency amplifier and oscillator service. Manufacturer ratings and operating conditions identify it as an RF power device rather than a receiving or small-signal triode.
Transmitting power triode intended for RF amplifier and oscillator operation. Its published service data center on radio-frequency power generation and the plate loading expected of an industrial transmitting tube.
