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Woven mesh material really seems to have disappeared in tube manufacture by the early 1930s. A close-up of the mesh plates on the Cardon 80. A Majestic 80 and a Cardon mesh plate 80. Spec sheets for the 80 can be found here: here. Anywhere a 5Y3 works, I use an 80 on an Octal/UX adapter. These always sound very good and in my experience have been durable, long lasting tubes. These are some of my favorite tubes in the collection, and are my first choice for rectification if available on the amp in question. This very early tube type dates to 1927 and was used in countless early radio sets. Here are a lovely collection of Type 80 globe tubes. Over the years I’ve gathered up one or two samples of many of the rectifier tube types, and here are a few of the best samples from my collection. ![]() In fact, changes in the rectifier tubes can sometimes have a more profound influence on the sound quality than changes to power or input tubes. There is a school of thought that rectifier tubes cannot influence the sound of an amplifier, but in my experience this is false. Rectifiers are some of the most interesting, and controversial, tubes in hifi. ![]() "A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction." -Wikipedia
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