• 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.

Build GU50 PSE

Two pieces of GU50 in PSE junction can deliver more than ~ 35W output power with very little internal resistance and low primary anode impedance (~ 1-1.25kOhms). With Shade feedback and a THD distortion criterion of ~ 2% output power can be greater than 25W (up to 30W!) so you should definitely try something like this.
 
Chassis:
 

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