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Andrew,
I have found that leaving the fan on while viewing gives a 'boiling' image from air turbulants in the tube.
I found this out by accident. I had a boiling image for about 15 minutes, and thinking the mirror was still giving off heat I went to turn the fan on, only to find it was already on.
I turned the fan off and the image cleared in under 1 minute.
We live and learn.
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