Thanks, Mark! I¡¯ll give that a try. Might actually have time over the holidays to do so. Jim
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On Dec 20, 2024, at 10:24?AM, Mark Vincent via groups.io <orangeglowaudio@...> wrote:
?Jim,
Your focus control could be dirty. See if it has the tabs on the back that can be bent back enough to put in some contact cleaner. The 1meg resistors and resistor parallel to the focus preset (2meg in this case) in these strings are stressed by the voltage across them. Even the 453/4/A types have this problem even though they are a higher value of resistance. Replace with 1W types. I got 1W 1% types from China on epay. I would get at least 40, if not more, for stock. The 150V zener could be bad. Also replace the two 22meg 1/4W carbons, R1659 and R1684, with Vishay VR37 series.
Mark
