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When to replace tubes on a CD player?

I have a CD player (Ah! Tjoeb 4000) that uses two tubes in its configuration. Can anyone let me know when the tubes "are expired" for lack of a better word. I'm using Mullards at the moment. Cheers...Dave.
canucks0

Showing 1 response by newbee

newbee
4,797 posts
 
When they become noisy or the high's/upper mid range becomes dullish, that is they lose the luster inherrent in tubes.
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