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.
great. too many audiofreaks tend to favor one type of device and circuit type and completely refuse to consider other options. I've done several tube input stages that have SS output stages, and they sound great.
One of my first hybrid designs is here: http://home.c2i.net/semfielec
look at tube/mosfet amp