When do you change tubes on amplifiers?
Bought an Audio research VSI60 used 18 months ago. Have no idea the age of these tubs. Think the amplifier sounds good but maybe there is more sound hidden?
How do you know if drive tubs or power tubs need replacing?
Look at the getter (the chrome-like coating on the inside of the top end of the glass envelope) of each tube. As the tube is used, that "flash" is burned off.
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