This tube amplifier is constructed uses point-to-point connections and the majority of the parts have been salvaged from old electronics. The amplifier uses 6T9 compactron vacuum tubes in a push-pull output stage. The preamp section uses 12AX7A tubes.
DIY 6T9 Push-Pull Tube Amplifier Project - [Link]
http://www.electronics-lab.com/blog/?p=3168