Davoli Tube amplifier safely ventilation grid

thingiverse

Different models of vintage Davoli tube amplifiers from the 1960s or 1970s rely on EL504 tubes. These tubes operate at an impressive 450 volts. Unfortunately, the original ventilation grid often suffers damage due to excessive heat buildup. As a result, it's alarmingly easy to accidentally touch this live voltage with your bare finger - a situation to be avoided at all costs! To mitigate this risk, consider shielding the round cutout in the amplifier's wooden enclosure with a custom-made laser-cut ventilation grid. It's essential to fabricate this grid from Polyoxymethylene (POM), a material that can withstand temperatures of up to 150 degrees Celsius and is robust enough to handle the heat without sustaining damage. In contrast, acrylic materials are unsuitable for this application due to their tendency to warp or shatter when exposed to high temperatures.