• 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.

Exploded view of valves

This is my favorite image of a beam tetrode:

I had hell with the cross-eyed 3D rendering...
No way to just stare at it and see anything.
Manilla background does not match surround,
so eyes tend to miscue on that.

Eventually made a window of my hands about
8 inches in front of my face. First look at the
handwindow, then let focus drift to the screen.
Mine about 3 feet away (pic blown to full 21").

Move handwindow closer or further to adjust
your crossing.

Slight headache now, but beam tetrode was
worth some pain. Don't attempt if your eyes
are spring loaded, else find out the hard way...
Keep WD-40 and shoehorn within arms reach.
*sound of corks*

Onadesedays I gotta try that with the XRay.
Big parallax from right to left. Just gotta keep
the valve from rolling as the tray moves.
Last edited: