Old trinitron lose signal after a 30 min. on

someone give me an old Trinitron (all dusty inside, very dusty), works ok the first 30 minutes but after a while it start to lose the signal gradually, a if a turn it off and wait for a couple of minutes, the signal is back but only for a few minutes more, anybody knows how to fix this, or have you hear about something like this? any help is welcome. cheers

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