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.
Years? Not necessarily.....if the player is left on all the time, which is not unreasonable, if one wants to have the player warmed-up and ready to go all the time. 10,000 hours is about 14 months.
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