Tube amplifier powered with LiIon batteries

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=5LwRb-xF2Ts

The amplifier uses 2 Li-ion batteries combined with a MAX1771 SMPS to supply 6 russian subminiature tubes. The series filament string current is just 37 mA. • The preamp is composed by two 1J24B pentodes, followed by a paraphase PI also using two 1J24B tubes in triode mode. The power stage has two 1J29B tubes in push-pull with a 100V line transformer as the output. I'm using the 0, 0.625w taps for the plates and the 2.5w tap as the center tap. • The voltage at the CT is 110V with the batteries fully charged and falls to 85V with the batteries almost discharged. • I'm using a 4 speaker inside this small 180x180x80mm wooden box, previously used as an ammeter. • I tried to show some different gain settings in this video. When the volume is maxed there is a fuzzy kind of distortion. This was intentional, to have some extra distortion and feedback. • The output is only 0.3W, but don't let that fool yourself! That is really loud for a living room. • More info at: • http://www.diyaudio.com/forums/instru...

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