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My suggestion: Parallel to the main switch in the set I solder a rectifier diode (p600d), so the set gets only half the power consumption when connecting with the mains. And when the tubes lighted up, I switch the set on. The voltage at the electrolytics (c105, c106) remains in the specified range.
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Isn't this set a power transformer operated set? I don't think that the power transformer is gonna like having a rectifier diode between it and the powerline.
Anyway, many electrolytic caps can take a few seconds of overvoltage. Some are marked with "surge voltage" ratings.