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6L6
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{{Short description|Vacuum tube}} {{Infobox vacuum tube |image = [[File:Tube 6L6 Sylvania.jpg|190x502px]] |caption = A 6L6 tube manufactured by Sylvania |classification = [[Beam tetrode|Beam power tetrode]] <!-- Mandatory --> |service = [[Class-A amplifier]], [[class-B amplifier]], [[class-AB amplifier]], (audio amplifiers) |height_in = 4.25 <!-- inches --> |diameter_in = 1.438 <!-- inches --> |weight_lbs = <!-- pounds --> <!-- Cathode --> |cathode_type = Indirectly heated <!-- Mandatory --> |heater_voltage = 6.3 |heater_current = 900 mA |filament_voltage = |filament_current = <!-- Anode --> |max_dissipation = 30 <!-- Mandatory --> |max_voltage = 500 <br /> Specification listed is for type 6L6-GC <!-- Socket Connections --> |pinout = [[File:BPT Pinout.png|thumb|left|125px|The 6L6 Pinout, metal versions had the shell connected to pin 1]] Pin 1 β [[not connected|n.c]] <br /> Pin 2 β Heater <br /> Pin 3 β Anode (Plate) <br /> Pin 4 β Grid 2 (Screen) <br /> Pin 5 β Grid 1 (control) <br /> Pin 6 β n.c <br /> Pin 7 β Heater <br /> Pin 8 β Cathode & beam-forming plates <!-- Class A amplifier ops --> |class_a_amplification_factor = |class_a_anode_voltage = 350 V |class_a_anode_current = 54 mA |class_a_screen_voltage = 250 V |class_a_bias_voltage = β18 V |class_a_anode_resistance = 5 kOhms <!-- Class C amplifier ops --> <!-- Recommend the use of highest rated CCS specification --> |class_c_power_output = |class_c_anode_voltage = |class_c_anode_current = |class_c_screen_voltage = |class_c_bias_voltage = <!-- Class AB amplifier ops --> <!-- Recommend the use of highest rated CCS specification --> |class_ab_power_output = 55 W |class_ab_anode_resistance = 5.6 kOhms |class_ab_anode_voltage = 450 V |class_ab_anode_current = 2*54 mA |class_ab_screen_voltage = 400 V |class_ab_bias_voltage = β37 V |reference = Essential Characteristics, General Electric, 1973 }} '''6L6''' is the designator for a [[vacuum tube#Beam power tubes|beam power tube]] introduced by [[Radio Corporation of America]] in April 1936 and marketed for application as a power amplifier for audio frequencies.<ref name=dreyer>J. F. Dreyer Jr., [https://worldradiohistory.com/Archive-Electronics/30s/Electronics-1936-04.pdf "The Beam Power Output Tube"], New York: McGraw-Hill, ''Electronics'', April 1936, pp. 18 - 21, 35</ref><ref>RCA Manufacturing Co. Inc., [https://worldradiohistory.com/Archive-Electronics/30s/Electronics-1936-05.pdf "Here is the New RCA 6L6 Beam Power Amplifier"], New York: McGraw-Hill, ''Electronics'', May 1936, back cover</ref> The 6L6 is a [[beam tetrode]] that utilizes formation of a low potential [[space charge]] region between the anode and screen grid to return anode [[secondary emission]] electrons to the anode and offers significant performance improvements over power pentodes.<ref name=dreyer/> The 6L6 was the first successful beam power tube marketed. In the 21st century, variants of the 6L6 are manufactured and used in some high fidelity audio amplifiers and musical instrument amplifiers.
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