Vacuum tubes never fades away unlike solid state amplifying devices where they become a fad now and a fade later. This is a fact, these 6L6s were introduced in the audio world some seventy (70) years ago and they still sell today with new production tubes coming from China and Russia. The 6L6 is a "beam" tetrode and was originally developed by RCA engineers and became an instant hit when radio manufacturers started using it in the output stages of some audio applications. 
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