• 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.

how easy to make tube amp?

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First I doubt you need 100W. Few people need more than 20W. I use 3-5W amps now adays. What the specs of the speakers you plan on using?
I've never dealt with kits before but I would highly suggest the El Cheapo schematic (its on the web somewhere). Before you start tube amps though learn about how speakers work and invest in a decent pair of efficient speakers.

Also don't build amps like me:
Throw something together that looks like it might work and then pray it doesn't kill you when you throw the on switch.
 
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