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well i also have a focus issue that when the set is turned on the picture appears clear at first but in a few seconds its not focused enough to read words but after about 7 minutes its focused enough to read but it could be better. the focus voltage is just shy of 5 kv so im thinking i will change the focus rectifier, i have one coming as the one in there may be leaking a bit. and the fly is new and so is the hv rectifier and the hv regulator tube and the hv is at 24.5 kv. i did lower the RGB drives and the drive lines did let up a bit so that is better, its really the focus issue thats got me now. i did check the tubes, demod and 6gu7s, all ok.
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