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C808 high DF self-heats and causes HV thermal runaway
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Vintage dave (talk | contribs) (C808 high DF self-heats and causes HV thermal runaway) |
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Again, this becomes more negative as the losses inside the transformer increase, but not by much if the transformer is healthy. | Again, this becomes more negative as the losses inside the transformer increase, but not by much if the transformer is healthy. | ||
A second path to thermal runaway on early serial numbers is C808, which resonates the transformer primary winding. Tek used a Sprague 160P DiFilm Black Beauty. In the 2020's, 160P's are exhibiting high Dissipation Factor when warm, enough to self-heat in this case. Replace with any modern capacitor. | |||
===Vertical Amplifier=== | ===Vertical Amplifier=== | ||