Vacuum Tube Power Supply 2015-08-26

Vacuum tubes were invented early in the twentieth century and quickly entered service in radio and television until replaced mid-century by transistors. They quietly faded into the background but are still available today. Several vendors still carry stock of tubes that were made by manufacturers who no longer exist. These are called New Old Stock or NOS. Some of these are extremely expensive and are mainly collector’s items. However, there are a few manufacturers who are still making brand...

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