[b][size="2"]The initial version of the 2A3 was a mono valve/plate construction with a modest 15 watt plate dissipation but RCA introduced a more powerful bi-plate design in the later 1930’s. Roughly speaking the bi-plate 2A3 was two 45 triodes in a single tube that sometimes shared a single plate which was reputedly easier to manufacture. However, the earlier monoplate (single valve) version is regarded as having superior sound quality and is highly sought after today, having only been in production for a few years. The VT-95 is the US military version of the valve. RCA seems to have been the most prolific manufacturer of the 2A3. American companies like Sylvania, General Electric, Raytheon, and Tung-Sol also manufactured the 2A3. Early monoplate valves were also manufactured under the old Cunningham (RCA) name and Arcturus. It was also manufactured in Europe by Brimar in England and Fivre in Italy. The USSR made a close copy of the 2A3 called the 2S4S/2C4C.[/size][/b]
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[b][size="2"]Fuente[/size][/b]
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