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How to tell vacuum tube is gone bad??

I recently purchased primaluna prologue 3 and I connect with dynaudio bm6a.

First I saw is lights of three vacuum tubes are dim and

other lights of three vacuum tubes are bright.

Among 6, 1 of vacuum tube has little soot on wall.
chunkichunky

Showing 1 response by tli

tli
52 posts
 
Listening is the final and most important test.

Failing or aged tubes in general lose bass energy, the sound will tend to be harsh. If so, it is time to change them.
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