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6B5 (6B5)

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Larry Anderson
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Circut application from Sylvania Radio Tube Technical Manual, Fifth Edition, 1942.

Sylvania 6B5 is a heater type output tube comprising two triode units mounted in an ST-14 bulb. The smaller or input section acts as a driver tube for the larger output unit and is directly coupled to it. The input cathode and output grid are connected internally. The tube operates without bias so there is no need for a cathode resistor and it's associated by-pass condenser.

  
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