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.
If they were new when you put them in, they should last 5000 to 10,000 hours! That's a lot of years. Newbee's response is what to look for in the future.
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