Thread: My new CTC-15
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  #7  
Old 09-17-2017, 12:01 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
Posts: 2,541
Great find. As you're probably already aware, the two ground stakes on the far right end of the chroma board exist in two states: either cracked or gonna crack soon. They need to be re-flowed as a matter of course on every CTC-12, '15, '16, '17 and '25.

When they fail, the heaters on the 6GU7s go out, causing the plate voltage to rise. Since the plates are DC-coupled to the CRT grids, this makes the CRT beam current go nuts, lugging down the HV supply. Pic blooms, loses focus and fades out.
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