Vacuum tubes continue to be used today in high end audiophile equipment in the recording industry, home and in music instrument amplification. Guitar amplification utilizes the highest percentage of current vacuum tube production.
I have been publishing test report results on the subject of vacuum tubes since 2002. The news is not good news. The trend is not a good trend.
If you click on the above image it will enlarge to a more readable size. I will refer to this image later in this piece.
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