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Class of operation for Tube Power Amps

My understanding is tube amplifiers can be ran in Class A or Class A/B operation just like Solid State amps. MANY tube amps do not say what class they are running. If they don't say this in the specifications do you just assume the are Class A/B. How can you tell?

willywonka

Showing 1 response by gkelly

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gkelly
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How to Tell the Difference: 

  1. Look at the number of output tubes: If the amp has only one or two output tubes, it's more likely to be Class A. If it has four or more, it's likely Class AB. 
  2. Check the power consumption: If the amplifier draws a lot of power relative to its output wattage, it's more likely to be Class A. 
  3. Observe the heat: Class A amplifiers run hotter than Class AB amplifiers. 
  4. Consider the design and circuit details:Class A amps often have simpler designs and fewer components. 
  5. Consult the manufacturer's specifications:The manufacturer's documentation or website will usually specify the amplifier's class of operation. 
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