• 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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Last edited:
...and some more pictures...
 

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Just a head up about directly heated tubes, you may want to avoid running them horizontally. The filament can sag and get closer to the control grid. In some cases you may operate the tube with the filament aligned with the vertical plane to avoid the sagging but either right side up or upside down would be best.
 
Just a head up about directly heated tubes, you may want to avoid running them horizontally. The filament can sag and get closer to the control grid. In some cases you may operate the tube with the filament aligned with the vertical plane to avoid the sagging but either right side up or upside down would be best.

Thank you my dear for the wisdom, but a server PS designed for strong forced air refuses to work in horizontal position, so I had to put it such a way in order to test. The filament fortunately is hung on good springs so nothing bad happened. :p

Don't worry, I will run it properly as soon as the cooling problem solves. :)