• 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.

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My amp last night on a home concert.
Thermal picture after the concert.
 

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My completed preamp with tube phono stage in same design as my thorens turntable.

In the housing i fitted passive alps volume control with remote input control.
Build in tube preamp is the Mini-Me.
http://www.diyaudio.com/forums/analogue-source/242855-mini-me-phono-preamp.html
The volume and input indicators are nixie tubes.
http://www.diyaudio.com/forums/tubes-valves/281206-retro-nixie-volume-indicator.html
Next i build Hypex NC 500 amp with tube symmetrical input stage in dual mono with the same design.
 

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Here is my Pete Millet low mu preamp with transformer volume control and input relays activated by knife switches.
 

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