• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tube powered subwoofer

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Eli Duttman

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Joined 2004
Talk to any of the custom "iron" builders. Optimizing an O/P transformer for high power and low frequencies only is not particularly difficult.

"Fixed" bias PPP KT88s in either a Williamson or Mullard style circuit will get the job done. Definitely SS rectify the B+. Antek's AS-4T360 should take care of all power requirements, except the small signal tube heaters. You could go DC there and knock the residual hum level for a loop.

Have you given any thought to crossover requirements?
 
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