• 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.

EF80 push EL153, DIY with a picture tells a story.

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An externally hosted image should be here but it was not working when we last tested it.
 
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Design software is very simple, using ARTCAM PRO. This can be done in the software needed here all vector design, analog design. And can generate three-dimensional images can be generated toolpaths can be simulated processing. In short, it can still all be on paper. Until the satisfaction of all the design, it can make a cnc machining toolpaths generated according to the design.

The following figure shows the layout of the original program of Figure 2 is already visible openings plan.
 
Panel sides working out. Difficult to see, in order to achieve beautiful results, I used the hardest working of 1050 pure aluminum. Easy generation transparent dense pure alumina chemical reaction in the post-processing (Ruby) surface. Alumina surface generated about 30-40 microns thickness, color and transparent. Aluminum processing is relatively simple, the resulting surface-treated aluminum oxide surface because there are impurities, the color gray. Here are the most difficult points in the entire machine DIY place. Many enthusiasts of the enthusiasts are stop there.

The following is a surface treatment will be carried out